If you're prepping for an epic day on the mountain or crag, layer on the Men's Polartec® Baselayer Tights. Constructed with midweight fabric for extra warmth under your gear, their odor-resistant HeiQ Fresh technology and flatlock seams keep you comfortable during long days of wear. A horizontal flip-out fly offers easy access, while the gusseted crotch on this pair of thermals increases mobility.