The O'Neill Men's Hammer Short-Sleeve Spring Wetsuit maintains exceptional styling, fit, and unrestricted movement with 100% super stretch materials. The body is made with 40% UltraFlex DS and 60% FluidFlex to form a shield that's measurably lighter, warmer, and more flexible. The Double Superseal Neck is fully adjustable and watertight. Strategic seamless paddle zones and a seamless lumbar design add to the comfortable fit. The Hammer Spring Wetsuit also features a wind-resistant smoothskin chest and back, Glideskin neck facing, back zip system, and flatloc-stitched breathable seams. This O'Neill Spring Suit is 2mm neoprene in the body with 1mm in the arms and legs.