The resistance band is sturdy, and the belt will bring you comfort. Improve the general fitness, help increase strength and endurance. The swim belt tether is very convenient for your family, thoughtful gift selection Features - Color: Black - Material: SBR, PP, Latex - Size(Ankle Buckle): About 39.00X10.00X3.00cm/15.33X3.93X1.18inch - Size(Elastic Bands): About 110.00x2.00x1.50 cm/43.31x0.79x0.59 inch - The swimming training belt is packed in a mesh bag, which is convenient for carrying. - In addition, the swimming resistance band is used for easy installation. - Available as static swimming belt, swim trainer, aqua jogger belt. - The adjustable swim training belt is for attached to an elastic tether, which you can fasten on the pool's ladder or any other fixed place. - With this swim tether, you can swim non stop and swim in place without having to turn, and can also do breaststroke, free style, backstroke, whatever you like.