Most charitable organizations fighting against breast cancer sponsor events like marathons and local rallies. Female MMA fighters have taken a more unique approach.
Not just any bras, mind you, but collectors' items worn and signed by the likes of UFC Women's Bantamweight Champion Ronda Rousey, ring girl Arianny Celeste and several other female mixed martial artists from various promotions.
As highlighted on the fundraiser's eBay listing, each sports bra comes with an autograph and some auctions throw in a photo as well. For added ease, there's a searchable index to help bidders seek out certain items.
If you're looking for sportswear from a specific athlete, the Keep A Breast Foundation also has a partial list of participants.
As of Friday morning, Rousey leads all auctions with a $340 bid, followed by Invicta FC 4 headliner Bec Hyatt at $330.
Other women whose bras have received high bids include Celeste, Felice "Lil Bulldog" Herrig, Maureen "Baby Face" Riordan and Julie Kedzie.
Auctions are also active for UFC 157 co-headliner Liz Carmouche, as well as top-ranked Bellator flyweight Jessica Eye, who recently defeated Bellator Strawweight Champion Zoila Frausto Gurgel in December. Bidding ends on January 6, with no returns allowed on delivery.