The O'Neill Hyperfreak 5/4+ Mens wetsuit with chest zip is 5.5mm and 4.5mm thick, bringing you extra warmth without losing the stretch and flexibility we love so much. If you are looking for an extremely stretchy wetsuit, the Hyperfreak is a great choice. Featuring Technobutter 3 neoprene this 5mm wetsuit for men is comfortable and unrestrictive.  Perfect for all watersports from surfing to swimming. Key Features: F.U.Z.E. Closure Minimal Seam Design 360 degrees Barrier with Drain Holes Double Super Seal Neck Construction: Full ody/Legs: TechnoButter 3 Arms/Shoulders: TecnoButter 3X Glued and Blind Stitched Seams TB3X Fully Taped Seams