Best sweat-proof gym underwear: 9 workout-ready options
Let’s face it, nothing kills the gym vibe faster than underwear that rides, rubs and wriggles away from you. You’re there to get your sweat on, in a good way, not in an uncomfortable, moist (sorry) and confidence-destroying way.
But the right pair of gym underwear? They're the unsung hero of leg days, cardio sessions and those days when you regret signing up for a HIIT class. And performance underwear has seriously levelled up – no more bunching or more moisture mishaps, just pure, breathable bliss.
We’ve rounded up the best gym underwear to keep you cool, dry and focused, no matter how intense things get. Because if you’re going to break a sweat, your underwear shouldn’t be working harder than you are.
The best gym underwear to buy in 2025
The Workout Thong
Specifically designed for workouts, this stylish thong was engineered to be worn with tight and restrictive activewear whilst remaining comfortable and staying put. The material is sweat-wicking and breathable with four-way stretch and antimicrobial properties.
Suki Bonded Briefs
For serious seamless-ness, Reebok's silky soft Suki Bonded Briefs provide expert support while feeling barely there. You get a pair in white, black and grey to go with every piece in your activewear collection and at under £10 a pair, they're great value for £££.
3-Pack Sports Hipster Briefs
At only £15, this trio of nude coloured Sports Briefs are a a worthy buy. They use the innovative DryMove material to keep you comfortable during particularly hard-hitting workouts while remaining lightweight and breathable. They're also available in a range of different silhouettes.
InvisiWear Mid-Rise Bikini Underwear 3 Pack
You can assume correctly that Lululemon knows its stuff when it comes to the perfect yoga essentials. So why not pick up a pair of its seamless, smooth and non-slip underwear for your next Reformer or yoga class?
Seamfree Thong
When working out on your period, sometimes that's extra reassurance against leaks can make a world of difference to your confidence but you don't want to feel bulky or heavy in tight leggings and shorts. Made from a sustainable Merino wool, this lightweight thong provides lightweight coverage for spotting or emergencies.
Seamless High Leg Thong
Some of us just prefer a thong when it comes to working out, and the experts at Gymshark have developed the perfect option for the gym. It's high-rise for shape, seamless, and the body-contouring waistband creates a pretty line.
SmoothFit Bikini Brief
Made from a unique bamboo viscose blend, Step One's ultra-comfy briefs are a must-try for those after serious sustainability and comfort points. They're hypoallergenic, gentle for sensitive skin, super breathable and moisture-wicking.
Pure Stretch 3-Pack No Show Thong
The perfect pair that you can wear to work, to the gym, on dates and lounging around, this sleek, stylish and silky soft set of Under Armour thongs are the ultimate in versatility.
Flexifit™ Modal High Waisted Thongs
For the most flattering of high-waisted silhouettes, look to Body by M&S, which provides not only an affordable option to shop but also a stylish and versatile pair for every occasion.
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