ZenTherm Top features strategically placed insulating panels which paired with a waterproof construction keeps you warm and dry to push further, for longer; Thermal protection technology; Solvent free Neoprene using water based technology; 4 way stretch; Zoned Neoprene technology; 2.5mm Neoprene; Glideskin neck seal; Water repellent plush lining for extra warmth; Helioflex, thermal, quick dry water repellent lining panels; Slik grip cuff seals; Glued and Blindstitched with critical internal taping; 90% Neoprene; 10% Nylon