These Limited Edition thick skins are single sided fleece instead of double sided fleece like IR's standard Thick Skin. This offers a lower profile fit while still keeping you warm and dry. Modelled after a surf-style tight fitting rash guard, the Thick Skin is made with 200 weight, 4-way stretch polyester fleece that is low bulk, dries quickly, and as a result has an excellent warmth to weight ratio. The tight fit allows the shirt to absorb less water, and it doesn’t sag when damp. The Thick Skin is warm enough to be worn by itself underneath a jacket on cooler days, or as a low profile base layer on freezing days. Also features flat seam construction and a high turtleneck style collar.