Riot Swim Bixi Bikini Bottom in Brown. - size M (also in L, S) Riot Swim Bixi Bikini Bottom in Brown. - size M (also in L, S) 87% nylon 13% spandex. Hand wash cold. Side tie closures. Adjustable sliding fit. RIOR-WX6. BIXI-B-BS. For swimwear that's equal parts sexy and flattering, Riot Swim is about to be your favorite brand. Black-owned and founded in 2016 by model Monti Landers, the swimsuits range from high-waisted bikinis to ruched one-pieces that will make you feel confident. The bestseller, the Echo, gives you legs for days, perfect cleavage, and it doubles as a bodysuit.