Expedition Weight is our wannest base layer for extreme cold. We offer two types: Our classic double-faced polyester fleece gives you a heat-trapping fuzz factor, inside and out. The single-sided stretch version has 12% spandex for amplified flex; its smooth jersey-knit exterior layers effortlessly under shells. Both manage moisture and have a contoured fit that leaves room for layering. Made in USA and imported. W's Capilene Expedition Weight Fleece Zip-T