When the temperature drops, you need to be able to rely on warm clothing to face the cool days and chilly nights. Choose the Arc'teryx Covert men's half-zip fleece sweater with clean lines, advanced design, and versatile thermal performance. Designed for low-output hikes and everyday warmth, this mid layer is made of slightly stretch Alpenex II™ fleece fabric that resists pilling, rock snags, and pack rub. This is a versatile garment designed for hiking, but there’s a good chance you’ll grab it for daily, durable warmth. Layering is the key of keeping you dry, warm and using your energy efficiently. Put into the right systems, a good sequence of layers moves moisture away from your skin, conserves or dissipates heat and provides you with weather protection. Here they are. The first layer, worn next-to-skin will provide warmth and quickly move moisture away from your skin. Then, the mid layer, is the insulation and fleece, that provides warmth while also dissipating heat during periods of high output. And finally, the third layer, the shell, which is the most weather-protective layer, worn on the outside of all other layers.