Terramar Ecolator CS 3.0 Fly Front Fleece Pants - Men39;s fleece Constructed of 95% Micro Polyester, 5% Spandex Climasense (CS) treatment is designed to respond to your body's changing conditions to keep you comfortable not matter what your activity level The CS system adapts to the skin's surface temperature, providing a warming effect when you are cold and a cooling effect when you are active, with a dynamic moisture transport system Climasense offers advanced odor control and uses bluesign approved, performance based technologies Dual surface knitting system incorporates high loft grid channels for enhanced breathability and effective layering for colder weather