O'Neill's top of the range Psycho Tech chest zip mens wetsuit in 5/4+, bringing you 5.5mm and 4.5mm thickness to keep you extra warm and cosy while not losing any of its stretch and flexibility. Our absolute favourite 5mm mens wetsuit in the range! If you want the best of the best, this is the one. Suitable for all year round in climates like Ireland. Key Features: F.U.Z.E Closure (chest zip) Redzone Water Resistant Zipper 360 degrees Barrier With Drainholes Construction: Fluid Seam Weld Stitch-less Seam Technology Fully Taped TB3X Seams Arms/Shoulders/Shins/Calf: Technobutter 3 Chest/Back: Technobutter 3 Air-Firewall Smoothskin Thigh/Butt: Technobutter 3 Firewall