The upper back D-ring optimizes torso lean and keeps the shins parallel to the ground to simulate the acceleration phase of sprinting. Lower-back D-rings can wrap around the sides to perform reverse sled pulls or be connected with a single carabiner for more upright sled dragging. Heavy duty 3” nylon webbing. Can also be used with resistance trainers. Padded neoprene shoulder straps keep users comfortable during rigorous sprinting routines. Leash is 1-1/2” nylon and has a carabiner on each end for quick attachments. 10’L.