Akona understands the importance of reducing dependence on oil-derived chemicals. Akona's earth-friendly neoprene uses limestone that is over 99.7% calcium and does not rely on oil as extensively as petroleum-based neoprene. Akona wetsuits features a full length molded Delrin zipper and a #10 YKK marine-grade brass slider. This superior combination of zipper and slider is the ultimate in corrosion resistance and strength. The glued-and-stitched zipper dam is "skin-out" for added seal and reduced water flushing. The closely guarded, unique lamination process of bonding the nylon to the rubber and Akona's new, strategically designed pattern matched with lightweight, limestone based neoprene is the science behind Akona wetsuits. All seams are flat-lock sewn for strength and durability. Suit has reinforced, laminated knee pads. Glide-skin neck minimizes water entry and flushing of the suit. The neck, wrists and ankles of this wetsuit are finished with elastic binding for comfort. Akona's wetsuits are the most comfortable and best fitting wet suits in their class.