STRETCH: High Tech High Resistance Hybrid Material that stretches like the human body! NO HARDWARE: Nothing to hurt your hands or feet, no loud or disrupting noises when you drop it on the hard floor, and nothing to fumble with and adjust during your peaceful practice VERSATILE: Yoga, Dance, Physical Therapy, Strength Training, Gymnastics, and virtually any kind of sports related stretching exercises EASY TO USE: Beautiful, simple and timeless infinity design creates a subtle twist that always keeps the dual loops open for easy use and a more ergonomic grip US Patent 9,561,397 - Made in USA