A base layer pant made with soft, plush 29% Greenplus ® environmentally friendly polyester, 64% polyester and 7% spandex a heavy weight, stretchy, double sided fleece. Provides exceptional warmth and keeps you feeling dry. Flat seam construction to prevent chaffing, gusseted crotch, and low profile boxer style waistband. Antimicrobial finish. UPF rating 40+ (blocks 97% of UV). Note: colors other than Black and Navy are the old style Polartec.