Our Elastic Loop Bands Expander for Exercise is made of 100% natural latex from Malaysia, which makes Our Elastic Loop Bands soft and odorless. The resistance bands can remain high elastic after years of training and exercising. Adding resistance and weight to your workout with the workout bands makes exercise more effective. These exercise bands are ideal for pull-up assistance, adding resistances to a press-up, speed training, bench press, squat, shoulder press, etc.