Using this resistance elastic belt can strengthen muscles, increase endurance and improve speed, it is very suitable for daily resistance training. You can attach the belt to any pole around the swim pool for swim exercise and training, which can make swimming more difficult and provide additional resistance. Made of TPE material, this belt is wear-resistant and sturdy. Waist belt is wrapped with neoprene, which brings you comfort. The belt can extend to 7 times longer. There are two s for you to choose, including 4 m and 3.0 m. It is suitable for butterfly stroke, backstroke, breaststroke and freestyle, also, it is suitable for men or more professional swimmers. Item Name: Swimming Resistance Belt Material: TPE, Neoprene Features: Convenient, Load Bearing, Strength Training Size Details: Size: 4 m, Inner Diameter: 0.6cm/0.2", Outer Diameter: 0.9cm/0.4", Length: 400cm/157.5" (Approx.) Size: 3.0 m, Inner Diameter: 0.6cm/0.2", Outer Diameter: 0.9cm/0.4", Length: 300cm/118.1" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bandage 1 x Waist Band 1 x Swimming Resistance Belt 1 x Storage Bag