Thermal set of shirt and bottom. Recommend to order 1 size up for comfort fit. Lightweight but warm. Waffle knit retains body heat to keep you warm. Convenient Fly front. Shrinkage controlled for lasting size and shape. Includes: Thermal 4pc set (2) tops + (2) bottoms. 65 % Cotton and 35% Polyester. So buy this and Save $27.99 Off on Men's Thermal Long Johns Underwear - 4-Piece Set for $22 with free shipping at Rakuten.com.