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. So, if you're environmentally conscious the Akona Quantum Stretch suit is for you! Akona wetsuits features a full length molded Delrin zipper and a #10 YKK marine-grade brass slider back zipper entry with a pull tab leash for easy self-donning and doffing. 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.