blueseventy Men's Sprint Sleeveless Wetsuit 100% Yamamoto #38 Neoprene - stretchy and bouyant. Super Composite Skin (SCS) Coating in legs and arms for better durability Silicone wrist and ankle cuffs. Lower rear collar for comfort. 1.5mm Neoprene in arm and arm gussets for flexibility. Buoyancy panels provide lift in the lower body for improved body position. 5mm Yamamoto chest panel . 4mm SCS coated Yamamoto torso & hip panel. 5mm Yamamoto lower leg panel. 1.5mm Yamamoto arms and underarm gussets. 1.5mm Yamamoto back panel surrounding zipper. 1.5mm silicone quick release wrist and ankle cuffs