20K/20K Dermizax fabric and fully taped seams for comfort in any conditions 60g Thinsulate insulation keeps you warm without bulk and weight Thigh vents let cool air in and boot gaiters keep snow out Items treated with a Water-Resistant Coating will allow water to bead and run off, keeping you drier than fabric alone. Boot Gaiters prevent water, snow, and mud from getting inside your pants or boots.