The ultimate speed training device available! Add speed, power and explosiveness to your game. Complete with seat belt strength nylon material over-the-shoulder harness that adjusts to any user. Padded shoulder straps help keep user comfortable during training sessions. Almost 10' long seat belt material nylon leash allows training partner to lightly hold or add resistance to athlete during sprints, runs or workouts. Leash clips on to harness and has double-wide padded handle for one- or two-handed resistance by trainer. Resistance training is the best way to add speed, power and explosiveness to your arsenal.