The SLX Series delivers excellent warmth and stretch, with a smarter offset back zipper and glued & blindstitched seams. Smarter offset ("OS") back entry design keeps the zipper off the spine to reduce pressure and increase flexibility and comfort; with glued and blindstitched zipper flaps and a reinforced zipper base. Texture embossed rubber that provides excellent wind resistance; ideal for outer chest panels hoods, and other areas that would otherwise lose warmth quickly. A fully sealed, maximum stretch seam construction that keeps water out. Neoprene panels are glued and pressed together, then blindstitched (needle doesn't fully penetrate neoprene, keeping water out). Can be finished with seam taping for added stretch, durability, and comfort. Smarter product design means minimizing seams to maximize stretch. Any seams used are always pre-bent and contoured for a truly engineered fit. Contoured, durable panels that stretch with you.