The Spyder Accord Half-Zip Baselayer Top sits softly against our skin as a baselayer or wears well as a mid-layer for apres ski revelry. The 360-degree stretch polyester is brushed to hold in our body heat while also being breathable moisture-wicking and quick-drying to regulate our moisture and temperature in colder weather. That's a nice synthetic solution to our winter layering system on and off the mountain.