Oneill Hammer Jacket Mens #3478 The Hammer series maintains exceptional styling, fit, and unrestricted movement in each style with 100% super stretch materials. Features: o100% Super Stretch oDouble Super Seal Neck oFlatloc Stitched oBody: 40% UltraFlex / 60% FluidFlex oChest/Back: Smooth Skin oKnee: Krypto oNeck Facing: Glide Skin oBack Zip System oDouble Superseal Neck o#10 YKK Zipper oFlatloc Stitched (Breathable Seam oStragetic Seamless Paddle Zones oLumbar Seamless Design