Ab Straps - Commercial Grade Ab Slings Made out of heavy duty Cordura nylon, with reinforced straps and stitching, for the maximum in strength and durability The straps have Turn-and-Lock, forged steel carabiners that hook into any universal gym Inside the bottom of the strap is heavy duty, high density foam to support and cushion the arms during use, covered with a soft, brushed nylon for comfort The sides of the straps have been lined with a brushed nylon that protects the arms and makes the Ab Slings easier and more comfortable to use Gym quality or home use