Zoot Sports Men's Z Force 3.0 Wetzoot Wetsuit (Black) neoprene Front Body: 4mm Yamamoto C39 Neoprene. Back Body: 3mm Yamamoto C39 Neoprene. Upper Sleeve: 2mm Yamamoto C39 Neoprene. Under Sleeve: 2mm Yamamoto C39 Neoprene. Front Leg: 4mm Yamamoto C39 Neoprene. Back Leg: 3mm Yamamoto C39 Neoprene. Seat: 5mm Yamamoto C39 Neoprene Machine wash cold, Gentle cycle, No softeners, Dry Flat, Do not bleach, Do not dryclean CN