O'Neill Youth 2mm Hammer Short Sleeve Spring Suit Body: 100% UltraFlex DS, Chest/Back: Smooth Skin Knee: Krypto, Neck Facing: Glide Skin Back Zip System, Double Superseal Neck, #10 YKK Zipper Flatloc Stitched (breathable seams), Strategic Seamless Paddle Zones Lumbar Seamless Design