Accept no limitations. O'Neill's exclusive Modular Closure system with new dual cinch on the neck and hood closures seal out water. The Mutant Legend is constructed of TechnoButter 3X neoprene and TechnoButter Firewall in the chest and back, making it warmer and more flexible. Light, warm, durable, stretchy and one of our most versatile wetsuits. Legendary sessions live on forever.