The O'Neill Mutant series features our Modular Chest Zip, an industry-first interchangeable system that allows users to swap between neck and hood closures. Adapt to the conditions with this versatile suit built with 3rd Gen TechnoButter neoprene and Fluid Seam Welds for flexible, lightweight warmth and premium watertight seam construction. A legend reborn with greater flexibility, durability, and easier entry/exit. Modular Chest Zip Closure Single Seal Interchangeable Neck and Hood Seamless Contortionist Shoulder Design Tapered Cuffs with Plasma Wrist and Ankle Seals Recycled Oyster Shells and Eco Carbon Black Infused Neoprene Recycled Dope-Dyed Yarn Liners Aqua Alpha Solvent Free Neoprene Lamination Key Pocket with Loop Triple Glued and Blindstitched with Exterior Fluid Seam Weld Technology Chest, Back, Legs: Recycled TechnoButter 3 Arms, Entry: Recycled TechnoButter 3X PLUS (+) = 0.5mm Extra thickness for even more warmth | O'Neill Men's Mutant Ii 4/3mm Chest Zip Full Wetsuit W/ Hood in Black, Size XL