No matter if your on the hill or using them at the office, your base layers are crucial for staying warm in cold temperatures. The Under Armour ColdGear Armour 1/4 Zip Top utilizes a dual-layer fabric that has an ultra-warm, brushed interior and a super slick exterior which is also extremely fast drying. A cool feature about this top is the built in Moisture Transport System which helps wick sweat off of your skin enabling you to stay cool and dry longer, at the same time, Under Armour packed in a anti-odor technology which prevents odor causing bacteria from forming keeping you nice and fresh. This top is extremely comfortable and most of that is thanks to its soft fabrics as well as its flatlock chafe-free seams. This prevents zipper irritation and allows you to have complete freedom of movement.