Best Bamboo Underwear for Women: 7 UK Brands Compared

Our pick of the seven

Bamboo underwear
that stays put.

Flissie women's bamboo boxer shorts are buttery soft, breathable bamboo viscose, with a 6 inch leg that stays put and a wide, flat waistband. Every size from UK 8 to 30, at one price.

★★★★★ 4.7 out of 5 from 336 reviews

Choose my pair

£13.50 a pair, or £11.50 a pair in a 10 pack. Free UK delivery. 60 Day Wear Test.

This compares seven bamboo underwear brands sold in the UK on fabric composition, leg length, size range and price, checked on each brand's own product pages in July 2026 and again in October 2026.

Rated 4.7 out of 5 from 336 reviews (Judge.me, 10 November 2026)

★★★★★

"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"

Verified buyer, United Kingdom, April 2026

★★★★★

"These boxers are brilliant as the leg doesn't ride up and nothing digs in."

Val, United Kingdom, verified review, December 2025

★★★★★

"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."

Verified buyer, United Kingdom, April 2026

★★★★★

"They never rolled up under my trousers and the waist band was unnoticeable"

P.O., United Kingdom, review, January 2023

★★★★★

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

Amalie, United Kingdom, verified buyer, August 2026

★★★★★

"Fabulous once I got the right size!"

Marian, United Kingdom, verified buyer, May 2026

Some reviewers earned a reward towards a future purchase.

Start here: what makes bamboo underwear worth buying

Before the brands, the thing that will save you money.

Bamboo underwear is genuinely comfortable. Viscose made from bamboo is buttery soft, smooth, breathable and moves moisture faster than cotton. Those are the real reasons to buy it. If sweat is the main reason you are looking, our guide to moisture wicking underwear compares bamboo viscose with synthetics, merino and absorbent pants.

So when you compare the seven below, compare them on fabric composition, leg length, size range, certification and price. Big numbers on a label, such as "4.5x more breathable than cotton", are a brand's own marketing figures, so look past them to what the fabric is and how the pair is cut.

The seven compared

On a phone, swipe the table sideways to see every column.

Specifications and prices checked on each brand's own website, or a UK stockist, between 4 and 7 October 2026. Marks & Spencer could not be rechecked in October, so its row is from 30 July 2026. We have no commercial relationship with any of these brands.

Best bamboo boxers in the UK

Worth separating out, because "bamboo underwear" and "bamboo boxers" are not the same purchase.

Most bamboo underwear brands make briefs, boyshorts and thongs. Very few make an actual long-leg boxer. Of the seven above:

• Flissie makes a 6 inch and 9 inch boxer short, in buttery soft bamboo viscose, with a leg that stays put
• Step One's Body Short has a short leg with friction-resistant inner-leg panels, which is a different approach to the same problem
• Boody's boyleg and BAMBOO COOL's boyshort are short-leg. Comfortable, but they do not reach the point where most thighs touch. Boody also makes 6 and 10 inch Seamfree Undershorts, slip shorts in 79% viscose from bamboo, which we compare with ours in our Boody review
• BAM makes bamboo boxers for men. For women it now sells a Smoothwear Seamless Midi Short as well as briefs, but it does not state a leg length, and sizes stop at UK 18
• Spairs and M&S stock briefs and short styles rather than long-leg boxers

If a long leg is what you are after, that narrows to Flissie (us) and Boody's undershorts, or, at a shorter length with panels, Step One. If you want a long leg and you do not mind that it is not bamboo viscose, the wider field is in our long-leg anti-chafing comparison, where Woxer's modal and Thigh Society's cooling knit both reach 9 inches.

Which to pick, by what you actually want

• A long leg for thigh chafing: Flissie women's bamboo boxer shorts (ours), 6 or 9 inch, Boody's 6 or 10 inch undershort, or Step One's panelled short
• The softest feel with no leg elastic at all: Boody's boyleg replaces the leg band with a soft hem, which matters if elastic marks are your problem
• The lowest price: Spairs at 5 packs from £9.99, or M&S multipacks
• Buying on the high street with easy returns: Marks & Spencer
• A UK brand you can look up: Flissie, BAM, Spairs and M&S are all UK. Step One is stocked at John Lewis
• Multipacks from Amazon: BAMBOO COOL, which sells in 4 and 5 packs and advises sizing down because of the stretch
• Sizes above UK 30: none of these seven. Snag runs UK 4 to 36 and Chaffree covers UK 6 to 34, though neither is bamboo viscose

The seven, one by one

Each card gives the price, who it suits and the trade-offs, checked between 4 and 7 October 2026 unless it says otherwise. Ours is first because we make it; the rest follow the table.

1. Flissie women's bamboo boxer shorts (ours)

Shown in Sage green, 6 inch leg

Also in black, pine green, taupe white and chocolate brown. The 9 inch leg comes in black and pine green. Pictured: Flissie women's bamboo boxer shorts (we make them).

See the 6 inch leg

Wrong size? We swap your whole first order free, as long as you try one pair and send the rest back unopened.

2. Boody

3. Step One Body Shorts

4. BAM

5. BAMBOO COOL

6. Spairs

7. Marks & Spencer

What each brand claims, and whose claim it is

Comparison articles usually launder marketing into fact. Here is who says what.

BAMBOO COOL states its fabric is "up to 4.5x more breathable than cotton". That is their figure. We have not seen the test method behind it and would treat it as marketing.

Boody describes its fabric as buttery-soft and seamfree. The seamfree construction is verifiable, it is knitted as a tube. The composition, 79% viscose from bamboo with 15% nylon and 6% elastane, is published, which means roughly a fifth of it is not bamboo at all. They label it accurately, which is more than much of this category manages.

Step One calls its inner-leg panels UltraGlyde and positions them as friction-resistant. Their term, their claim. The composition, 95% viscose made from bamboo and 5% spandex, is published and checkable.

Various retailers in this category state that bamboo is antibacterial or hypoallergenic. Treat those as marketing unless a brand shows its test.

Us: Flissie women's bamboo boxer shorts are 95% Tanboocel bamboo viscose with 5% elastane, dyed to OEKO-TEX Standard 100, which means tested for harmful substances. It is buttery soft, breathable and moisture wicking, and the claim we back with money is the fit: if they ride up, rub or roll within 60 days, you get a full refund, worn or not.

The sustainability question

What bamboo viscose has going for it. Bamboo grows fast and regrows from the same root system without replanting. Closed-loop viscose production recovers and reuses most of the solvent and water, which is meaningfully better than open-loop. OEKO-TEX Standard 100 certification means the finished fabric has been tested for harmful substances.

Our own position. Ours is closed-loop production, OEKO-TEX Standard 100 dyed, and posted in plant-based packaging that is industrially compostable.

What to check before you buy any bamboo underwear

The four things worth two minutes of your time:

1. The actual composition. "Bamboo" on the label usually means viscose made from bamboo, often blended with nylon or elastane. A pair described as bamboo can be 20% something else, which is fine, but you should know
2. The leg measurement, if you are buying for chafing. Most brands do not publish one. Boyleg, boyshort and body short can mean anything from 2 to 5 inches
3. Certification, not adjectives. OEKO-TEX Standard 100 and closed-loop production are checkable. "Eco-friendly" and "natural" are not
4. The wash instructions. Almost all bamboo viscose wants a cool wash and no fabric softener. Wash it cool and air dry it, and it keeps its softness wash after wash

Why Flissie is our pick if your thighs rub

Best for: a long leg for thighs that rub, in bamboo viscose.

Flissie women's bamboo boxer shorts come in a 6 inch or 9 inch leg, in buttery soft bamboo viscose, UK 8 to 30, with every size the same price. £13.50 a pair, 6 for £75 (£12.50 each) or 10 for £115 (£11.50 each), and every 10 pack comes with a free 30 day tub of our perimenopause supplement (worth £29). Free UK delivery, 60 day comfort guarantee, free size swap on your whole first order. Designed in Derbyshire.

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

"Very lightweight, so far it's making hot and humid days bearable." Lynette, verified review

What you get:

• A leg that stays put. No ride up and no roll, in a 6 inch leg for every day or a 9 inch leg in black and pine green
• One price in every size. UK 8 to 30, £13.50 a pair, or £11.50 a pair in a 10 pack, with free UK delivery
• A wide, flat waistband. It sits flat and does not dig in
• The 60 Day Wear Test. Wear them for 60 days. If they ride up, rub or roll, you get a full refund, worn or not (return postage at your cost)
• A free size swap. Between sizes, size up. We swap your whole first order free, as long as you try one pair and send the rest back unopened. A cool wash and an air dry keep them soft, and the care guide has the detail

"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!" Marlene, United Kingdom, verified review (reviewer earned a reward for a future purchase)

"Fabulous once I got the right size!" marian c., United Kingdom, verified review (reviewer earned a reward for a future purchase)

There are more than 300 more of those.

Our boxer shorts are here, and the size guide has hip and waist measurements.

A note on men's bamboo underwear

We only make women's, so we are the wrong people to ask. BAM and Step One both do men's bamboo ranges and both are easy to buy in the UK. We mention it only because people land here looking, and sending you away is more useful than pretending otherwise.

Not sure about the size?

If the size is wrong, we swap your whole first order free, as long as you try one pair and send the rest back unopened.

From S (UK 8 to 10) to 3XL (UK 28 to 30), one price.

If you are between sizes, size up. They have a mid-high, wide, flat waistband; if you would rather it sat above a fuller tummy, size up.

Choose my size

Free UK delivery and a 60 day guarantee from purchase: full refund, worn or not (return postage at your cost).

Your questions answered

What is the best bamboo underwear for women?

Depends on the style. If your thighs rub, Flissie women's bamboo boxer shorts (we make them), with a 6 or 9 inch leg, or Boody's 6 or 10 inch undershort. For the softest short-leg option with no leg elastic, Boody's boyleg. For price, Spairs or M&S multipacks. For anti-chafe panels in a short style, Step One. Compare composition and leg length rather than adjectives.

What are the best bamboo knickers in the UK?

If you want briefs, boyshorts or thongs rather than a long leg, Boody, Spairs and Marks & Spencer are the easiest to buy in the UK, and Spairs is the cheapest at five packs from £9.99. Bamboo knickers and bamboo boxers are different purchases: knickers stop at the hip, so they will not help with thighs rubbing.

What are the best bamboo boxers in the UK?

Very few bamboo brands make a genuine long-leg boxer. Flissie women's bamboo boxer shorts (we make them) come in 6 and 9 inch. Step One's Body Short is shorter with friction-resistant inner-leg panels. Boody's Seamfree Undershort comes in 6 and 10 inch, as a slip short in 79% viscose from bamboo. Boody's boyleg and BAMBOO COOL's boyshort are short-leg, so they will not stop thighs touching. BAM makes bamboo boxers for men, and its women's midi short does not state a leg length.

What is the downside of bamboo fabric?

Two practical ones. It likes a cool wash, no fabric softener and an air dry, and it costs more per pair than cotton. Look after it that way and it stays buttery soft, wash after wash. In a 10 pack, Flissie women's bamboo boxer shorts (we make them) work out at £11.50 a pair.

Is bamboo underwear antibacterial?

No, and it does not need to be. What keeps underwear fresh is a breathable fabric and a clean pair every day. Flissie women's bamboo boxer shorts (we make them) are breathable, moisture wicking bamboo viscose, dyed to OEKO-TEX Standard 100.

Is bamboo underwear hypoallergenic?

Bamboo viscose is smooth and, when dyed to OEKO-TEX Standard 100, tested for harmful substances. Many people with sensitive skin get on well with it. Flissie women's bamboo boxer shorts (we make them) are dyed to OEKO-TEX Standard 100, with no side seams and a wide, soft waistband.

Is bamboo underwear actually sustainable?

Bamboo grows fast and regrows without replanting, and closed-loop production recovers most of the solvent and water used. Flissie women's bamboo boxer shorts (we make them) use closed-loop production and are dyed to OEKO-TEX Standard 100. Look for closed-loop production and OEKO-TEX certification rather than the word "eco-friendly".

What does "viscose made from bamboo" actually mean?

Bamboo pulp is dissolved and re-spun into a fibre. The result is viscose, chemically the same class of fibre as rayon. It is soft and breathable, and it is not raw bamboo. US Federal Trade Commission guidance is that labels should say viscose or rayon rather than just bamboo, which is why we write "bamboo viscose".

How should I wash bamboo underwear?

Cool wash, inside out, with similar colours. No fabric softener, as it coats the fibres and reduces breathability. Air dry rather than tumble dry. This applies across nearly every brand here, not just Flissie.

Which bamboo underwear brands are UK-based?

Flissie, BAM and Spairs are UK brands, and Marks & Spencer is a UK retailer. Step One is Australian but stocked at John Lewis with UK shipping. Boody is Australian with a UK site. BAMBOO COOL sells mainly through Amazon.

Is bamboo underwear worth the extra cost over cotton?

If you want a smoother feel and faster drying, most people say yes. If you want the lowest-maintenance option, cotton is more forgiving in the wash and cheaper. We go into this properly in our two years of wearing bamboo viscose instead of cotton.

What is the best plus size bamboo underwear?

Flissie women's bamboo boxer shorts (we make them) run from UK 8 to 30 at the same price in every size, and Boody goes up to 4XL, which is UK 22. Above UK 30, Snag runs to UK 36 and Chaffree to UK 34, though neither is bamboo viscose.

Should I size up or down in bamboo underwear?

It depends on the brand, so read each size chart. BAMBOO COOL advises sizing down because of the stretch, while for Flissie women's bamboo boxer shorts (we make them), which run from S (UK 8 to 10) to 3XL (UK 28 to 30), we say size up if you are between sizes. The size swap on your whole first Flissie order is free.

Related reading

• Bamboo viscose vs cotton underwear, two years in
• Best women's boxers: 10 brands compared
• Best anti-chafing underwear: 5 long-leg options
• Cotton underwear for women: what to look for, and when it wins
• The most comfortable knickers in the UK: 8 pairs compared