Featuring O'Neill's exclusive urethane coated Membrain Zipper, the patent pending Modular Closure System is the most innovative chest zip system on the market. Firewall X-type and the redesigned Kyrpto Knee Padz greatly improve the fit and ergonomics of this series. The new Exterior Fluid Seam Weld seam construction makes this two-headed monster the star performer of the wetsuit freakshow.