The O'Neill Womens Psycho Tech Back Zip now comes 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 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: ZEN Zip Closure Redzone Water Resistant Zipper 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