???? We are professional in Professional Products , we pay more attention to the workmanship and also the raw material.All of our products are thoroughly tested before we ship them out to you.And each resistance band made of 100% Malaysia natural latex Elastic:arm resistance bands:45lb; leg belt:55lb;Resistance training is very effective in increasing muscle strength and burning fat. Multifunctional: It is very conducive to your training, such as boxing, fencing, basketball, soccer, tennis, track and field sports training, to enhance the leg strength of any squat action or participate in any movement to promote jumping, speed and strength, build strength and explosive power as you take your physical skill to the a higher level. Material:Made from high quality natural latex, nylon fabric and ABS, soft latex material for comfort, easy and safety use Excellent design：The product is designed from a biomechanical perspective to enhance the movement of leg strength. It is very helpful for improving the jump, speed and strength, and is suitable for any sports program.