Sports bra rash is a common skin issue caused by friction, sweat, and repeated movement during exercise. It often appears as redness, soreness, or broken skin under the bust, around the band, or where straps rub — and it’s especially common during running, cycling, gym workouts, and endurance sports.
If you train regularly, sports bra rash can be uncomfortable, painful, and slow to heal. The good news? It’s also highly preventable.
Click the picture above to see how Bum Butter helped Sabrina Pope Humphreys
What Causes Sports Bra Rash?
- Sports bra rash (a form of chafing) usually develops due to:
- Friction between skin and fabric
- Sweat and heat softening the skin
- Long workouts or repeated sessions
- Tight seams, bands, or poorly fitting sports bras
Over time, constant rubbing can break down the skin’s protective barrier, making irritation worse and healing slower.
How Bum Butter Helps Prevent Sports Bra Rash
Bum Butter is designed to reduce friction and protect skin during movement. Applied before exercise, it forms a breathable, long-lasting barrier that helps:
- Prevent chafing under sports bras and straps
- Reduce irritation during long or sweaty workouts
- Stay effective without feeling greasy or heavy
Although originally created for cyclists, Bum Butter is widely used to prevent chafing anywhere friction occurs — including under sports bras.
Can Bum Butter Help Heal Sports Bra Rash?
Yes. If you already have sports bra rash, Bum Butter can also support the healing process.
Used between workouts, it can:
- Soothe sore, irritated skin
- Protect damaged areas from further rubbing
- Help skin recover more comfortably
Apply gently to clean, dry skin and allow time for healing before returning to training.
Prevent Chafing and Keep Training
Click the picture above to see how Running.Fitness.Me found Bum Butter really helped.
"Felt this little gem needed a shout out, if only if it helps one person who suffers with chafing whilst running.
I have suffered terribly this last year with under-boob chafing on pretty much every run - some days worse than others. (Sorry if too much skin - we're all grown ups, right). 😁 I've tried different size and different material sports bra's and a few anti-chafing brands, yet the chafing has continued to make running and post running, especially that post run shower, super painful. I resorted to using Rock Tape, which tbf, helped, but was not ideal. (It was suggested that my skin, due to my age, could be thinning in this area as this has only started happening in the last year, which makes sense).
Anyway.... I was recently introduced to @bum_butter. Sceptical, but I was willing to give it a go and man alive, I'm glad I did.
5 runs in, including a 12 miler and ZERO chafing!! 🙌
It's been a game changer and I wish I knew about it sooner. May have avoided some scaring!
It smells lush, too, but I can't say under-boob sniffing is a thing for me. 😜
I highly recommend if chafing is a thing for you, too."
Whether you’re looking to prevent sports bra rash or help irritated skin recover, Bum Butter offers proven protection against friction — helping you train comfortably and consistently.
Less friction. Better workouts. Happier skin.