What's the return policy?

If you’re not satisfied with your first pair of bamboo women’s boxer shorts, we offer a 60 day comfort guarantee. We’ll replace or refund your women’s boxers if they don’t meet your expectations. If the sizing is wrong, we’ll send the right size free.

Do you offer free delivery?

Yes - free UK delivery on all orders of bamboo women’s boxer shorts. International shipping is available worldwide, free on our 7 boxer shorts pack or £85+ spend. We use Royal Mail Tracked and dispatch within 1 business day.

How quickly do you dispatch orders?

We use Royal Mail and dispatch orders within 1 business day of receiving your order.

What packaging do you use?

We use plastic-free corn starch packaging for our bamboo women’s boxer shorts that’s 100% compostable - an eco-friendly choice from checkout to doorstep.

Women's Bamboo Boxer Shorts - Soft 6" or 9" Leg, UK 8-30

Q: How do free size swaps work?

If the size isn't right, we'll swap any unopened pairs for a different size, free of charge, within 60 days of purchase. Just email hello@flissie.com with your order number and which size you'd like. We usually respond within one working day. Worn pairs can't be swapped for health and hygiene reasons — so try one pair first before opening the rest.

Made with super soft bamboo and designed to stop chub rub so you stay comfy all day.

Flissie womens boxers in brown, green and pink

Flissie Womens Boxers in sage green on a model size medium

Flissie womens boxers in sage green showing model wearing them from behind

Model wearing pink Flissie womens boxers in a size small

Model wearing plum pink Flissie womens boxers in a size small

Model wearing Flissie womens boxers in the colour fawn brown and wearing a size large

Model wearing fawn brown Flissie womens boxers in a size large

Picture of three women wearing Flissie womens boxers

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Breathable bamboo underwear fabric, Flissie women's boxer shorts

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Flissie Women's Boxer Shorts in Pine Forest Green

Flissie Women's Boxer Shorts in Lavender

Flissie Women's Boxer Shorts in Plum Pink

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Why we use a 6 inch and 9 inch boxer short leg length

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Flissie green boxer shorts shown in 6 inch length

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No thigh rub
Doesn't ride up
No digging
Stays cool
Soft on skin
No visible line

4.6 from 351 reviews
Free UK delivery
Free US & EU on 7 packs
60 day guarantee & size swap

Colour: Black

Size: S

2XL

3XL

Length: 6" (best daily comfort + anti-chafing)

6" (best daily comfort + anti-chafing)

9" (bicycle short length)

What size am I in Flissie?

The basics

Flissie boxers are sized to UK standard women's sizes from UK 8 to UK 30, in both 6" and 9" inseam lengths. The fit sits close to the skin without compressing — bamboo viscose has natural stretch and recovery, so the boxers move with you and stay in place.

Between sizes? Size up.

Flissie boxers rely on full skin contact to glide rather than friction-bunch. Sizing down compromises the anti-chafing function — most between-size customers say the smaller size never quite stops feeling tight.

Quick hip-to-size guide

UK size	Letter	Hip (cm)
UK 8–10	S	86–91 cm
UK 12–14	M	94–101 cm
UK 16–18	L	104–111 cm
UK 20–22	XL	114–121 cm
UK 24–26	XXL	124–131 cm
UK 28–30	XXXL	134–141 cm

The full size chart with waist and hip measurements is on our size guide page.

Switching from another brand?

From Boody, Step One, or M&S: Flissie runs true to UK size. Take your normal UK size.

From TomboyX, Knix, or other US brands: convert to UK first — US sizing typically runs one to two sizes smaller in numeric labelling.

6" vs 9" — does length affect size?

No. Both inseams share the same waist sizing — pick by leg-length preference, not size.

Soft enough that you forget you're wearing them

77% mention comfort

41% mention how soft they are

Of 351 verified reviews. Those are the two things customers say over and over, usually in the same sentence.

95% Tanboocel bamboo viscose with 5% elastane. Soft from the first wear rather than needing breaking in, breathable, and it moves moisture rather than holding it against you. Smooth seams, no tag.

It feels like these boxers were made to fit my body! So comfy, the waistband doesn't dig in, soft and fitting fabric that doesn't roll up. Wish I'd found them sooner, definitely will buy more!!

KerryUK

I love hot weather undies and these are the softest I've tried. So comfortable I hardly know I'm wearing them, brilliant!

LindaUK

Who Flissie women's bamboo boxer briefs are made for

Best for anti-chafing

The 6" inseam covers the inner thigh past the point where most chafing happens, and bamboo viscose creates a smooth, low-friction surface that lets thighs slide rather than catch. Reviewers consistently report doing long walks, festivals, half-marathons and long summer days chafe-free for the first time in years.

Best for hot weather

Bamboo viscose is breathable and temperature-regulating, so it moves moisture rather than holding it against the skin. It is what customers mention most after comfort and softness on warm days.

Best for postpartum recovery

Soft, non-digging waistbands sit comfortably above or below a C-section scar. The wide gusset and longer leg lengths reduce friction during a recovery period when movement matters. Many of our customers wear Flissie throughout pregnancy and the months after birth, when comfort matters most.

Why bamboo boxers?

Softer than cotton — bamboo women’s boxer shorts

Super soft

Bamboo underwear relieves stress, reduces anxiety & improves mood

Comfortable

Fan to represent breathable bamboo underwear

Breathability keeps you cool

Superior sweat absorbing

Hypoallergenic bamboo underwear for sensitive skin

Kind to sensitivity

Fights bacteria + odour

Comfortable by design

Black women’s boxer shorts — Flissie bamboo boxers

Longer Leg

Women’s boxer shorts that don’t roll up - stops chafing, perfect under dresses

Anti-chafing Panels

Frictionless bamboo boxer shorts keep your inner thighs silky smooth

Anti-dig Waistband

The anti-dig waistband on our women’s boxers relieves pressure and prevents soreness

How Flissie compares

An honest side-by-side with the brands customers ask us about most.

Feature	Flissie	Boody Boyleg	Step One Body Short	Thigh Society Cooling 9	TomboyX 9"	M&S Anti-Chafing
Inseam length	6" or 9"	~3"	~5"	9"	9"	~5"
Fabric	95% Tanboocel bamboo viscose, 5% elastane	Bamboo viscose blend	Bamboo viscose blend	Bamboo viscose blend	Cotton or modal blends	Polyamide / elastane
UK size range	UK 8–30	UK 6–22	UK 6–24	XS–4XL	3XS–6X	UK 6–24
Anti-chafing design	Yes — no roll-up leg band	Partial — shorter leg, can roll up	Yes	Yes	Yes	Yes
Designed for women's anatomy	Yes	Yes	Yes	Yes	Gender-neutral	Yes
Give-back programme	1-for-3 donation to women in need	No	No	No	Partner donations	No
UK origin	Designed in the UK	Australian brand	Australian brand	Canadian brand	US brand	UK
Price per pair (approx.)	From £13 (in 7-pack)	~£14	~£17	~£27	~£24	~£12

Comparison based on publicly available product information at the time of writing. We don't have a commercial relationship with any of these brands.

← Swipe to see all columns →

Bamboo, cotton or synthetic: what the fabric actually changes

The fabric of your underwear sits against your skin all day. It decides whether you chafe, sweat, itch, or simply forget you're wearing anything. Here is an honest breakdown, including the two things cotton does better.

Feature	Flissie bamboo	Cotton	Synthetic
Anti-chafing coverage	6" or 9" leg covers the inner thigh	Briefs leave thighs exposed	Only if the leg is long enough
Soft from the first wear	Soft immediately, no breaking in	Moderate, softens over time	Can feel slick or plasticky
Moisture handling	Moves moisture rather than holding it	Absorbs it, then stays damp	Wicks fast but traps heat
Temperature regulation	Cool in heat, warm in cold	Neutral, no active regulation	Heats up against the skin
Waistband	Wide band, designed not to dig	Depends on the brand	Tight bands can mark the skin
Tested for harmful substances	Dyed to OEKO-TEX Standard 100	Varies by brand and dye	Varies by brand and dye
Easy to wash	Cool wash, no softener, air dry	Forgiving. Hot wash, tumble dry, fine	Durable in the wash, dries fast
Price per pair	£20, or about £13 in a 7 pack	From around £3 in a multipack	From around £4 in a multipack

Good Mixed Poor

What each fabric is actually good at

Bamboo viscose is a regenerated cellulose fibre made from bamboo pulp. It is soft from the first wear, breathable, and temperature-regulating. Ours is Tanboocel, made in a closed-loop process where the solvent used to extract the fibre is recovered and reused rather than discharged, and without carbon disulfide. It is the same family as Lyocell and Modal. The trade-off is that it needs looking after: cool wash, no fabric softener, air dry.

Cotton is breathable, cheap and by far the most forgiving in the wash. Its weakness is that it absorbs moisture and holds onto it, which is why it feels damp after you sweat. For everyday wear in cool weather, a well-made cotton pair is a perfectly sensible choice, and it is what most gynaecological guidance still points to.

Synthetic blends dry fastest and last longest in the wash, which is why they dominate sportswear. They trap heat, they hold onto odour more than natural fibres, and they shed microplastics with every wash.

love them!

The material is very lightweight and breathable, and the sizing/fit is perfect. Love the colours!

Lovely feel

These are very comfortable and cool to wear

These are very comfortable and cool to wear. Prevents chafing when wearing dresses. They have been a godsend in this hot weather. They wash well too!

Really nice product. Shame they don't have bras!

What a great pair of pants

What a great pair of pants ..so comfortable. This is my first time trying a longer leg .
Planning on buying more

Really comfortable

Really comfortable. Wash well too

Really comfortable, felt cool and not sweaty during the recent hot weather. Will be buying more.

Bery lightweight, so far its making hot and humid days bearable.

Fabulous once I got the right

Fabulous once I got the right size!

Soft, breathable, comfy

I bought the black 9-inch leg in a large to accommodate my pregnancy bump. They are really silky soft and breathable, exactly what I wanted to avoid chafing. They are a little loose on the thigh as I am usually a medium, but it doesn't make them any less comfortable and means I will hopefully be able to wear them throughout the pregnancy and post-partum. If they made a version for periods that was super absorbent or had a pouch for a reusable pad, I would buy even more.

Ridiculously comfortable and easy to

Ridiculously comfortable and easy to wear

Perfect purchase!

So glad I bought these! They feel amazing, the colours are fab, and I'm definitely buying way more!

Perfect anti-chafe shorts!

Really soft, light weight boxer shorts, they come to a good length to prevent chafe and are a lot cooler than my sports shorts

Love mine so comfortable and soft will buy

Love mine so comfortable and soft will buy again

The best.

I have now bought this style pants from 4 suppliers and these are by far the best. Extraordinarily comfortable, they don't ride up and fit so well...love them.

Excellent product and customer service!

Received my order today. Super comfortable light material. Currently pregnant so I was looking for something comfortable but also nice and got exactly that. Great colours too. Think they will be great as my body changes as well as postpartum. I had an error in my delivery address (my own mistake) but the customer service was super quick getting back to me and resolved the issue straight away.

comfortable and nice

they are very comfortable and nice to wear, they feel good on the skin

So much more comfortable than traditional women's underwear

Really great quality boxers, so comfortable!

Sooooo comfortable

I’ve had an operation on my groin and so needed underwear that I’d soft and breathable as well as long in the leg. These boxers are brilliant as the leg doesn't ride up and nothing digs in. I shall be ordering more in different lovely colours.

Unreal

I will never wear anything else now. The bery best. Dont bother with others. Just buy these. ❤️

Comfort and quality

Nice pair of pants, they do ride up and I had to position them for this photo, mild camel toe situation, but not to a point where it deters me from wearing them or buying more. They look and feel great, haven't lost shape after their first few washes. I wish there were some more cool colors like blues available

They are very comfortable and keep moisture away from my skin

Have changed my life

These have changed my life, and I'm trying to get everyone I know to check them out. They make such a huge difference for my sensory issues (on the spectrum) and give me gender eurphoria (non-binary). A++++. I was worried the fabric would be so sort that it wouldn't hold up well to washes, but has been doing fine after a few now.

Brilliant boxers

Great item, soft and comfortable to wear. Maybe should have sized down but overall would recommend

Please bring them back in stock 😭 I LOVED them

Honestly so gutted that they’re out of stock as from 3/4 days in I noticed a difference in my mood, I was waking up energised, falling asleep easily and getting deep sleep. My relationship with my partner improved so much with me being so in tune and connected to myself and him. These are incredible for your s*x life! I felt sexy again, I genuinely have never looked in the mirror and felt as confident as I did whilst taking these pills. Honestly game changer, my skin cleared up and my periods were a LOT less painful! All round amazing

Please please bring them back

Since they’ve been out of stock and I ran out I purchased a similar pill however I am not sleeping, getting terrible headaches and have lost my sparkle that these gave me

Frequently asked questions

Product & fabric

What are Flissie boxers made of?

95% Tanboocel bamboo viscose and 5% elastane. Tanboocel is a closed-loop bamboo viscose where the chemicals used to process the fibre are recovered and reused. The fabric feels closer to silk than cotton — soft, breathable, naturally temperature-regulating, and gentle on sensitive skin.

What's the difference between the 6" and 9" inseam?

The 6" sits roughly mid-thigh — great under skirts, dresses, gym shorts, or for anyone who finds longer leg lengths too warm. The 9" extends to about an inch above the knee — the right choice for anti-chafing on long walks, runs, festivals, hot weather, or under flowing dresses.

Will they roll up my thighs like other boxer shorts?

No — and this is the single most common review comment from women who've tried other brands first. Flissie boxers use a specific leg-band tension and bamboo viscose's natural cling to stay in place. If you've had Boody, Step One, or M&S boxers roll up before, this is the design difference you'll feel immediately.

Will they show under leggings or fitted dresses?

No visible panty line. Flissie boxers are designed without a hem ridge, and the boyleg cut means no waistband indent either. For the smoothest finish under fitted fabrics, the 6" inseam in a nude shade is most invisible; the 9" works best under skirts and dresses where leg length isn't an issue.

Fit & sizing

What size should I order if I'm between sizes?

When you're between sizes, size up. Flissie boxers need full skin contact to glide rather than friction-bunch — going down a size compromises the anti-chafing function. Most between-size customers say the larger size feels exactly right after one wear.

How do free size swaps work?

If the size isn't right, we'll swap pairs for a different size, free of charge, within 60 days of purchase. Just email hello@flissie.com with your order number and which size you'd like. We usually respond within three working days. Worn pairs can't be swapped for health and hygiene reasons but we'll replace your whole order — so try one pair first before opening the rest.

Use cases

Are these good for menopause and night sweats?

Yes — bamboo viscose's moisture-wicking and temperature-regulating properties make Flissie one of the most-recommended options for perimenopausal and menopausal women. The fabric pulls heat and sweat away during hot flushes and night sweats. Many customers buy the 9" for sleep and the 6" for daytime.

Are they suitable for postpartum recovery?

Many customers find Flissie more comfortable than traditional postpartum pants — the soft, non-digging waistband sits above or below a C-section scar, the gusset is wide and gentle, and the longer leg lengths reduce chafing during recovery. They're not designed as surgical garments.

Are Flissie boxers OK for sensitive skin or eczema?

Bamboo viscose is naturally hypoallergenic and antimicrobial, and Flissie is dyed using OEKO-TEX Standard 100 certified processes. Customers with eczema, allergic dermatitis and post-treatment sensitivity routinely report Flissie as the only underwear they can wear without flare-ups.

Shipping & delivery

Is delivery free?

Yes — every UK order ships free, no minimum spend. International orders ship free on 7-packs; smaller orders to international addresses have a standard shipping fee added at checkout.

Do you ship internationally?

Yes — we ship worldwide. 7-pack orders ship internationally free of charge. For smaller pack sizes, shipping is calculated at checkout based on destination. Import duties or taxes (if applicable in your country) are the recipient's responsibility.

Will my order arrive in discreet packaging?

Yes. Flissie orders arrive in a plain, unbranded sugarcane mailing bag with no mention of the product on the outside. Inside, each pair is individually wrapped in compostable corn starch packaging. Nothing about the parcel signals what's inside.

Packaging & sustainability

What packaging do Flissie boxers come in?

Every pair is individually wrapped in compostable corn starch (PLA) packaging, and orders ship in fully recyclable, carbon-neutral sugarcane mailing bags. No plastic poly bags, no virgin plastic mailers, nothing destined for landfill. The corn starch wrap breaks down in a home compost; the mailer goes in your normal paper recycling.

Are Flissie boxers plastic-free?

The packaging is — both the individual wrap and the outer mailer are plant-based and home-compostable or recyclable. The boxers themselves are 95% bamboo viscose with 5% elastane (a small amount of stretch fibre needed for fit and recovery). We've removed every piece of single-use plastic we can from the production and shipping chain.

Where are Flissie boxers manufactured and how do you ensure ethical labour?

Flissie boxers are designed in the UK and manufactured by a closed-loop production partner that holds OEKO-TEX Standard 100 certification and meets ethical labour standards including fair wages, safe working conditions, and no child labour. We visit our manufacturing partners regularly and are working toward full B-Corp certification.

Returns & care

What's your return policy?

60-day return window on unworn pairs in their original sealed packaging. Free size swaps within that window — just email hello@flissie.com. Full refunds are also available within 60 days; return postage is at your cost.

How do I wash Flissie boxers?

Machine wash at 30°C with similar colours, inside out to preserve the dye. Use a gentle detergent — skip fabric softener as it coats bamboo fibres and reduces breathability. Air dry where possible; tumble drying is not recommended and will shorten fabric lifespan. Avoid bleach.

Buying

Why is the multi-pack cheaper per pair?

Lower per-unit packaging, shipping and admin costs let us pass on a real saving. A single pair is £20; the 7-pack works out to roughly £13 per pair — the same boxers, just better value when you stock up. Most customers buy a multi-pack backed by our 60 day guarantee.