SportFlex, Game For Anything.SportFlex is ready for sweat, sport, and everything in between. Made from a highly durable and soft-touch silicone, it’s waterproof, dirtproof, sweatproof, and stainproof. Shop Now Winning on WHOOPWorld-Class wearable meets world-class athlete. Join Cristiano Ronaldo on WHOOP and unlock your best performance. Explore Memberships