Speedster Tough Tow Resistance Trainers - 2 Pack Includes 1 Shoulder Harness, 1 Waist Belt, & 2 Tow Lines Develop maximum leg drive for increased accelaration. Perform short sprints, lateral shuffles, and forward/backward movements. Speedster Training Products are used by athletes, coaches, organizations and teams worldwide. Made in USA. 1 year conditional warranty