Recommended for any athlete but specifically designed for those in contact sports, the Body-Solid Tools Nylon Head Harness (MA307N) helps you condition your neck, upper back, and chest muscles. This neck exerciser is made with durable nylon, extra-heavy D rings, and a steel chain that can be attached to either free weights or high/low pulley machines (sold separately). The inside is completely padded with high-density neoprene to absorb shock and help prevent cuts, chafing, and abrasions. The Body-Solid Tools Nylon Head Harness measures 9.45 by 7.01 by 2.31 inches in length and weighs 2 pounds.