ColdPruf Men's Basic Dual Layer Bottom 100% Polyester Soft, cotton two-layer engineering traps body heat between layers resulting in chill-blocking warmth Pant sits at natural waistline. Front and back rise provides an exceptionally comfortable fit and maintains coverage during various activities Tagless labeling, non-itch waistband and gussets for added durability and comfortable fit Convenient functioning front fly Perfect as a base layer. Best for dressing with minimal layers in cold to very cold weather and low to medium activity levels