Breathable knickers cut as boxer shorts: a bamboo viscose knit that moves sweat away from your skin, and a 6 inch leg so sweaty thighs do not stick or rub. UK 8 to 30, one price.
£13.50 a pair, was £20. 6 for £75 (£12.50 each), or 10 for £115 (£11.50 each). Free gift with every 10 pack.
Moisture wicking underwear pulls sweat away from your skin and spreads it through the fabric, where it can dry, instead of holding it against you. That is the difference you feel on a hot day: the pair stays drier where your skin is, so it does not cling, chafe or go cold and clammy once you stop moving.
Flissie women's bamboo boxer shorts (we make them) are 95% Tanboocel bamboo viscose and 5% elastane, a fine, open knit that lets air through and moves moisture away from the skin. We designed them in Derbyshire for thighs that rub and days that run warm, so they are breathable knickers with a 6 inch leg rather than a brief: the leg keeps damp skin from sticking to damp skin.
Moisture wicking knickers, sweat wicking underwear, breathable underwear for women: whatever you call them, this is the same pair, in UK 8 to 30 at £13.50 a pair (was £20), 6 for £75 or 10 for £115, with free UK delivery and the 60 Day Wear Test: 60 days from purchase, a full refund, worn or not.
Breathable bamboo viscose and a 6 inch leg in every colour. UK 8 to 30, one price: £13.50 a pair (was £20), or £11.50 a pair in a 10 pack.
Last sizes
9 inch leg: black and pine green only, on the product page.
See all colours and sizesMost of the sweat you notice in underwear is where skin meets skin: the inner thighs, the groin and under the waistband. A brief stops at the top of the leg, so damp thigh rubs on damp thigh. Flissie women's bamboo boxer shorts carry the same breathable fabric 6 inches down the thigh, so there is a dry layer between your legs on a warm commute, a long walk or a summer wedding.
If sweat is the reason you are here, our guide to groin sweat in women covers why it happens, and our anti-chafing shorts page explains how the leg length stops thighs rubbing.
They have really been put to the test with this stinking hot summer and I'm not sweaty or chaffing.
No knickers are sweat proof, because no fabric stops you sweating. What underwear can do is one of two things. Moisture wicking underwear moves sweat away from your skin so it can dry. Absorbent underwear, such as period pants, holds liquid in a padded layer. Flissie women's bamboo boxer shorts are the first kind: they have no absorbent layer, so for leaks or periods you still need a pad or period pants.
If you have searched for sweat proof underwear for ladies because you sweat heavily or suddenly, and it is new or worrying, it is worth mentioning to your GP.
Cotton is soft and breathable, but it soaks up moisture and dries slowly. Cleveland Clinic's advice on chafing is to avoid cotton for exactly that reason (page last updated 29 August 2025). Breathable cotton underwear is still a good everyday choice when you are not sweating much; our guide to cotton underwear for women covers when it wins.
Synthetic sports fabrics, such as polyester and nylon blends, dry fastest. For a hard run or a hot gym session they are hard to beat, and they are what most running brands use.
Bamboo viscose sits between the two: soft against the skin like cotton, breathable and moisture wicking, and comfortable to wear all day rather than just for an hour of exercise. That is why we chose it for Flissie women's bamboo boxer shorts. For the full comparison, read our bamboo vs cotton underwear review.
Some brands sell cooling underwear made with treated yarns that feel cold to the touch. Flissie women's bamboo boxer shorts do not use a cooling finish. They stay comfortable in the heat because the knit is open and light and the fabric moves moisture away, so there is less damp fabric against your skin.
Under a summer dress, the 6 inch leg is the everyday choice and comes in every colour. The 9 inch leg sits just above the knee and comes in black and pine green.
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
Some reviewers earned a reward towards a future purchase.
Wash at 30 degrees or below and skip fabric softener: softener coats the fibres, which makes any fabric worse at moving moisture. Air dry rather than tumble dry. Our guide on how to wash bamboo underwear has the details.
Comparing brands first? Our guide to sweat wicking underwear for women compares six options.
Underwear made from a fabric that draws sweat away from your skin and spreads it out so it can dry, instead of holding it against you. It keeps you drier and less clammy than a fabric that soaks moisture up.
Bamboo viscose is breathable and moisture wicking, which is why we use it. Flissie women's bamboo boxer shorts (we make them) are 95% Tanboocel bamboo viscose and 5% elastane, a fine, open knit.
It depends on the job. For a hard run, a synthetic sports fabric dries fastest. For all day, our pick is Flissie women's bamboo boxer shorts (we make them): breathable bamboo viscose with a 6 inch leg that keeps damp thighs from rubbing, in UK 8 to 30 at £13.50 a pair, or £11.50 a pair in a 10 pack.
No fabric stops you sweating. Moisture wicking underwear moves sweat away so it can dry, and absorbent underwear such as period pants holds liquid in a padded layer. Flissie women's bamboo boxer shorts (we make them) are moisture wicking, not absorbent.
Cotton is breathable but soaks up sweat and dries slowly, so it suits days when you are not sweating much. Bamboo viscose is soft like cotton and moves moisture away from the skin, which suits hot days and long wear.
Dry skin rubs less than damp skin, so it helps, but the bigger fix for thigh chafing is a leg long enough to keep skin off skin. Flissie women's bamboo boxer shorts (we make them) have a 6 inch leg, or 9 inch in black and pine green.
Flissie women's bamboo boxer shorts (we make them) come in UK 8 to 30, plus size included, at the same £13.50 a pair in every size. There is a free size swap on your whole first order, as long as you try one pair and send the rest back unopened.
Yes. Both lengths are soft and light enough to sleep in, and there is no tag or thin elastic edge to press in overnight.
Yes. The 60 Day Wear Test gives you 60 days from purchase to wear and wash Flissie women's bamboo boxer shorts (we make them), with a full refund, worn or not, and return postage at your cost.
