The bicycle sweat belt is made of waterproof denim, mesh fabric and neoprene to protect your bike from sweat during workouts and rides. Key benefits - Prevents bike corrosion: designed for indoor trainer use to stop sweat from harming the frame. - Built in phone bag: updated version includes a practical phone case, eco friendly design, suitable for phones under 5.5 inches. - Keeps the bike clean: double-layer protective wheels, sweat-absorbing mesh fabric and waterproof diving cloth catch most sweat and hold it back from the frame and bottom bracket. - Easy to install: attach to the seat tube with one strap and secure a second bracket to the handlebars; fixes to the seat post and handlebars for effective sweat-wicking and protection. Specifications and compatibility - Materials: waterproof denim, mesh fabric and neoprene. - Phone compatibility: fits devices under 5.5 inches. - Installation: attaches to seat post and handlebars for stable, hands-free use. - Functions: sweat interception, frame and bottom bracket protection, easy maintenance. Use scenarios - Indoor trainer sessions where sweat can accumulate on the bike. - Outdoor rides or gym workouts where you want to carry a phone (up to 5.5 inches) in the built-in bag. - Long or frequent rides to keep the frame and bottom bracket dry and reduce cleaning time.