Men's thermal underwear two piece set. Waffle knit material that is pre-shrunk. Double layer arm and leg cuffs to hold in heat. Set includes pants and long sleeve shirt. Details: Please consider buying a size up as they may run small depending on the fit you prefer. Two piece set of pants and long sleeve shirt Pre-shrunk Light weight and warm waffle knit material Elastic waist band and fly opening Washing Instructions: Machine Wash Cold with like colors Non chlorine bleach if needed tumble dry low Warm iron if needed Size Chart - Small - Waist 28-32 Chest 33-36 - Medium 31-34 Chest 35-38 - Large - 34-38 Chest 38-40 - XL 37-40 Chest 40-43