Features .060" thick, multi-layered, rubber sole material. Wider construction for improved durability and electrical contact. Non-marking inner layer is neoprene, reinforced with polyester mesh insert. Black outer layer provides a highly conductive neoprene surface for superior grounding. Reversible cup design allows heel grounder to be worn on either foot. Reversible, 24" conductive ribbon may be positioned on either side of foot. Quickly and easily attaches to foot with 3/4", double-sided hook-and-loop material which will not fray with use. Comes with built-in 1MW resistor for added protection.