The glacier jacket features a polartec 100 microfleece which in case you didnt know is pretty much the warmest lightweight fabric you can get its also extremely quick drying so its easy to care for and is great for wicking away moisture as part of a layering system with solar protection and hem drawcord the glacier is the complete fleece for year round warmth wherever you roam features keeps you warm polartec 100 classic microfleece is soft and thermally efficient keeps out the sun