Synergy Triathlon Wetsuit - Men's Endorphin Sleeveless Quick John Smoothskin Neoprene for Open Water Swimming Ironman Approved SUITABLE FOR ALL LEVELS  Ironman approved. Athlete endorsed. Comes in wide range of sizes to insure a perfect fit. PROVEN TECHNOLOGY EQUALS SUPERIOR PERFORMANCE  Hydrodynamic neoprene made from Yamamoto #39 and #40 with SCS silicone coated SyPrene. 5mm thick core buoyancy panel / 3mm lower legs and back. EXCEPTIONAL FUNCTIONALITY  Full range of motion. Unsurpassed 680 percent flexibility. Highest grade anti corrode internal wetsuit zipper from YKK which greatly reduces drag as you move through the water. Super soft low neck with smoothskin on both sides and because it is so soft, it feels like you hardly have anything around your neck. MAXIMUM BUOYANCY - 5mm wetsuit, which is the maximum buoyancy allowed in triathlon wetsuits. Creates nearly double the buoyancy than 3mm suits, which are not recommended for cold waters. Float higher. Move faster. Save energy. CUSTOMER SATISFACTION - 30-Day Guarantee: If you are not 100% satisfied within 30-days, send it back for a full refund / 2 Year Warranty / Lifetime Replacement Guarantee.