Back Zip Wetsuit for Men. Features include: StretchFlight neoprene for increased warmth and comfort without sacrificing flexibility, 24% less CO2 emissions per wetsuit, Limestone-derivate eco-friendly neoprene made from scrap rubber tires and Bluesign® certified, Lining: WarmFlight® thermal fleece lining, Seams: GBS [glued and blindstitched] seams for maximum flexibility and minimal water entry, Taped internal seams, Entry: Back zip entry, Key loop, Aqua Alpha, non-toxic, water-based glues, Drainage holes.