Specification: Material: Latex Tube,Neoprene Belt. Belt length 1.2 meters, adjustment range is approximately 55cm-105cm. Size: S: 6*10*2m, M: 6*10*3m, L: 6*10*4m (Inner diameter*Outer diameter*Length). Features: 1. Meet All Your Need - Adjustable Neoprene waist belt is adjustable up to 40” and fits both adults and children. The latex bungee cord is 4 meters long, provides the right tension for static swim. 2. Build Strength And Endurance - The Swimming Belt is great for in-place training and resistance training, helps to Build Strength and Endurance. 3. Easy to Use - Black strap is used to fix the bungee cord to the shore of the swimming pool. So The swimmer uses the elasticity and resistance of the bungee cord to exercise. 4. Wide Application - Suitable for all adults and children who want strength training. Perfect for someone who wants a nonstop swim, or athletes who want a training workout. Package List: 1x Elastic latex rope. 1x Neoprene belt. 1x Strap