Material: latex tube + nylonsize:Blue 6mm*10mm*4m (inner diameter*outer diameter*length)Belt length: 1.2m, adjustable 55-105cm.SWIMMING TRAINER: The swimming training belt allows swimmers to kick freely, they can build stamina and practice stroke technique.High-quality material: Made of high-quality elastic latex tube, which is durable and has a long service life.CONVENIENT TRAINING: You have convenient access to training in a variety of locations, including backyards and hotel pools.Widely Used: The swimming suit can be used for freestyle, backstroke, butterfly and kick training.Package includes:1 x elastic latex tube1 x belt1 x tether