Forestman Men\'s Thermal Underwear Shirt This set of men\'s thermal underwear shirt is the perfect set for layering for extra protection against the winter in the great outdoors. This is as of its easily fitting design for under your clothes making this is ideal for when you\'re out hiking and need that extra layer of warmth. The ribbed construction of this thermal underwear has been designed so that it effortlessly shapes to your body and helping to provide the best fit possible making it hardly noticeable under your clothing. The fabric is designed to catch more of the warmth of the body keeping it close to the skin; keeping the body warm for a longer time. The base layer is made of a high cotton blend which gives you the most natural softness and comfort for wearing on long walks in cold weather. This shirt part of the set is long sleeved and has a longer length body to keep more of your body warm. It is perfect for wearing under other clothing as it is a tight fit to keep the warmth in. The thermal underwear set comes in the colour green and there are matching long john bottoms also available in our Amazon store. These sets come in 4 sizes Medium - XX-Large with chest sizes of 36 through 50.