Simms Thermal Midlayer Baselayer Bottom - Men'sOur warmest midlayer for cold days, the M's Thermal Pants feature a grid fleece interior that traps heat next to skin, without adding bulk or limiting range of motion. Smooth faced grid fleece layers perfectly with our baselayers to provide maximum warmth Self fabric waistband with dual snap closure and zippered fly allow for easy on and off transitions Dual slash handwarmer pockets Patterned with a gusseted crotch for maximum comfort and easy