Men Thermal Underwear Top by Outland; Base Layer; Soft Lightweight Warm Fleece Men's Extreme Ultralight Warmest Top makes your favorite cold weather activities more pleasant. Whether you are hiking; biking; hunting; snowboard; ski; camping or other outdoor sports; winter activities and even sleeping Outland's thermal top keeps you comfortable. The Thin Lightweight Thermal Clothing maintains your body heat at a cool temperature by wicking moisture away from your skin; drying quickly and insulating from the cold. The Basic Undershirt has an interior microfiber fleece that is soft and cozy; feels great against your skin We have your size! For adult men; juniors; teen; up to 6XL. SIZES RUN SMALL: if you don't like a tight fit; take a size up. Several solid color options, including tactical camo . Does not restrict movement; feels like second skin, with four-way stretch and gives you the needed warmth without thick or heavy layers. The shirt can be repeatedly washed without shrinking. Machine wash, dries quickly.