Summit Express Base Layer Top Designed in Boulder, CO Park City embroidered on outside of upper left arm Mid-Weight Performance Fabrication Turtleneck ¼ Zip Closure Exceptional Moisture Wicking and Heat Retention Properties 83% Polyester, 17% Spandex All aboard the Summit Express! Find the quickest way up so that you can race back down in this illustrated base layer. This mid-weight performance fabric has a brushed back providing next to skin comfort.