The Arc'teryx Covert Half-Zip men's half-zip sweater is the mid layer you need in order to stay warm and dry in all circumstances. It is the versatile piece that will take you from town to work to trail. The Alpenex II midweight fleece has been developed to create a fabric with the elegant look of wool. The polyester fabric has a brushed back knit that is engineered to provide versatile warmth and comfort. Its laminated pockets secure small essentials and give the Covert its iconic aesthetic. 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 second 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.