The Limited Edition Mens Thick Skin was released as IR's second product in 1998 (after the original Guide Shorts). This layering piece is a throwback to some of our first Thick Skin pieces. One of the major differences is these are single sided fleece instead of double sided fleece like our standard Thick Skin. This offers a lower profile fit while still keeping you warm and dry. Modeled after a surf-style tight fitting rash guard, the Thick Skin is made with 200 weight, 4-way stretch polyester fleece (93% polyester/7% spandex) 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.