The Shiver Football Sled is mounted on runners for maximum game-play replication. Adjustable from 32" to 44"H, get the ideal height so players can focus on proper punch technique, footwork, and body position for blocking. This trainer is perfect for players at the line of scrimmage, but it can be useful for all positions. By progressing down the 8'L x 12"H x 8" thick pad, players are able to shuffle their feet and deliver blows during the perfect practice for game day situations. Sleds weighs 515 lb.