We are one of the two brands here, so read this with that in mind. We have tried to be straight about where Calvin Klein is the better buy, because for a lot of people it will be. Specifications checked against both brands' own product pages in August 2026. Prices move, so treat them as a guide.
The short version
They are not really the same product. Calvin Klein's women's boxer briefs are a short-leg fitted brief, usually around 2 to 4 inches. Ours are 6 or 9 inches. That difference decides most of the rest.
Buy Calvin Klein if you want a recognisable brand, a short leg, multipack value, and a range that goes down to XXS.
Buy Flissie if your thighs rub, because a 2 to 4 inch leg does not reach where thighs touch and a 6 to 9 inch one does.
Our pick for thigh chafing is Flissie women's bamboo boxer shorts (we make them): a 6 inch leg against Calvin Klein's typical 2 to 4 inches, in every size from UK 8 to 30 at the same price. They come with a 60 day guarantee, full refund, worn or not, and a free size swap on your whole first order.
Try Flissie women's bamboo boxer shorts
£20 a pair, or £13 a pair in a 7 pack, in UK 8 to 30 at one price. Free UK delivery on every order, a free size swap on your whole first order, and a 60 day guarantee: full refund, worn or not.
Side by side
| Flissie | Calvin Klein | |
|---|---|---|
| Leg length | 6 or 9 inches | Typically 2 to 4 inches |
| Main fabric | 95% bamboo viscose, 5% elastane | Cotton blends and recycled polyester blends, varies by line |
| Size range | UK 8 to 30 | XXS to 3XL |
| Price per pair | £20, or £13 in a 7 pack | Varies by line and pack size |
| Reaches where thighs rub | Yes, that is what it is for | Not at that leg length |
| Range | One product, two lengths | Full underwear range |
| Where to buy | Direct only | Widely stocked, easy to try in person |
Where Calvin Klein wins
Best for: a short-leg boxer brief from a brand you can try on in a shop, in sizes from XXS.
Choice. They make briefs, thongs, bikinis, bralettes and matching sets. We make one thing in two lengths. If you want a range, that is not us.
Availability. You can walk into a department store and try them on. You cannot do that with ours, which is why the size swap on your whole first order is free.
Smaller sizes. Their range starts at XXS. Ours starts at a UK 8.
Durability under rough treatment. Their cotton and polyester blends survive hot washes and tumble drying. Bamboo viscose needs a cool wash, no fabric softener and air drying. If low-maintenance matters more than softness, that is a real advantage.
Brand. Fifty years of it. If you like the waistband, that is a legitimate reason to buy.
Where we differ
Best for: thigh chafing. Flissie women's bamboo boxer shorts (we make them) have a 6 inch leg, in every size from UK 8 to 30 at one price.
Leg length. The whole point. If thighs rubbing is your problem, a short-leg boxer brief will not solve it regardless of who made it. Womens boxer briefs at 2 to 4 inches do not reach where thighs touch. Flissie's run 6 to 9 inches.
Fabric. Bamboo viscose is soft from the first wear and moves moisture rather than holding it. Cotton absorbs and holds. Polyester dries fastest but traps heat.
Sizing at the larger end. Flissie's UK 8 to 30 range grades the leg opening and waistband width separately rather than scaling everything up, which is why the leg still sits flat at a 26 or 30.
One price. A UK 30 costs the same as a UK 8.
What we will not claim
Our fabric is not antibacterial and not hypoallergenic. Neither claim is substantiated for viscose made from bamboo, and plenty of brands in this category say otherwise. Our own honest assessment of bamboo underwear goes through it.
We are also not going to score Calvin Klein on sustainability. They are a large business with published reporting, we are two people in Derbyshire, and the comparison would not be meaningful in either direction. What we can tell you about ours is closed-loop production that recovers and reuses the solvent, without carbon disulfide, from FSC certified bamboo, and plant-based packaging that is industrially compostable.
Which should you buy?
If your thighs rub, buy the longer leg. Flissie's or anyone's. Leg length is what puts a smooth layer between your thighs, and the fabric is a secondary question.
If you want a short-leg boxer brief and a brand you can find on the high street, Calvin Klein is a sensible buy and we would not pretend otherwise.
If you are unsure, Flissie women's bamboo boxer shorts come with a 60 day guarantee (full refund, worn or not) and a free size swap on your whole first order, which is there precisely because you cannot try them on first.
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, UK, verified review (reviewer earned a reward for a future purchase)
Questions
Are Calvin Klein women's boxers good?
They are well made and widely available, and the fit is consistent. The limitation is the leg length: at 2 to 4 inches they will not stop thighs rubbing, which is what a lot of people are actually buying boxers to solve.
What is the difference between boxer briefs and boxer shorts for women?
Leg length. Boxer briefs typically run 2 to 4 inches, boxer shorts 6 to 9. Brands use the terms loosely, so check the inseam measurement rather than the name.
Is bamboo better than cotton for underwear?
Not universally. Bamboo viscose is softer from the first wear and handles moisture better. Cotton is cheaper, more forgiving in the wash and lasts longer under rough treatment. We compare them properly in our two-year switch.
Which is better value?
Depends on how you buy. Calvin Klein multipacks bring the per-pair price down considerably, and so does a 7 pack of Flissie women's bamboo boxer shorts (we make them): £20 a pair, or £13 a pair in a 7 pack. Per pair we are more expensive than a supermarket multipack and comparable to most premium brands.
How long is the leg on Calvin Klein women's boxers?
Typically 2 to 4 inches, depending on the line, so check the product page for the inseam. That stops short of where most thighs touch. Flissie women's bamboo boxer shorts (we make them) have a 6 inch leg in all 8 colours, and a 9 inch in black and pine green.
What sizes do Calvin Klein women's boxers come in?
XXS to 3XL when we checked in August 2026, so Calvin Klein is the one to choose below a UK 8. Flissie women's bamboo boxer shorts (we make them) run from S (UK 8 to 10) to 3XL (UK 28 to 30), at the same price in every size.
What are Calvin Klein women's boxers made of?
Cotton blends and recycled polyester blends, varying by line, so check the label. They survive hot washes and tumble drying, but cotton absorbs and holds moisture, and polyester dries fastest but traps heat. Flissie women's bamboo boxer shorts (we make them) are 95% bamboo viscose and 5% elastane, and want a cool wash and air drying.
Do Calvin Klein women's boxers stop chafing?
Not at their standard leg length. Nothing under about 6 inches reaches the point where most thighs touch, which is why the leg is the specification that matters rather than the fabric or the brand. Flissie women's bamboo boxer shorts (we make them) have a 6 inch leg that reaches where most thighs touch.
