1. Foot straps made of material: polyester fabric that is comfortable, soft and strong. It resists tearing and, when pulled from multiple directions, can withstand extremely forces and tensions. 2. Foot straps with adjustable function: this adjustable yoga strap helps improve the flexibility, balance and range of motion of your legs in a natural posture. With several weeks of consistent use, you will notice a significant improvement in range of motion and overall flexibility. 3. Foot loops and usage location: place the door anchor on a sturdy door post, close the door and then pass the strap through the Dring to elevate your posture. Just like a portable stretching machine. This leg extension device will not scratch or damage your door. 4. Unique gift foot straps: if friends and family need to improve the flexibility of the waist, back and legs during yoga, dance, ballet and gymnastics, this foot strap is a thoughtful choice. The training strap makes the gift appreciated.