Underworks Mens Cotton Performance Compression Crew Neck T-shirt 3-Pack CottonSpandex Made in USA Sizes: Measure Chest in Inches: Small 32-35 / Medium 36-39 / Large 40-44 / X-large 45-48 / 2X 49-52 / 3X 53-95 STRETCH COTTON - feels like cotton, looks like cotton, it is cotton - No shiny look SHAPES YOUR CHEST, TUMMY, AND SIDES - INVISIBLE UNDER CLOTHING - smooth feel and breathability from stretch cotton that moves with you in all directions. QUICKER RECOVERY FROM EACH WORKOUT - Wearing the Performance Compression T-shirt will help in quicker recovery of your muscles after your workout or ball game. Base layer or as athletic gear or as a top - Quality construction - Made in the USA The feel of cotton and the stretch and fit of spandex are merged together to stretch and conform to every curve of your body and move with you and fit you like second skin providing you unmatched comfort, fit, and durability. The most comfortable all day underwear. Made in U.S.A. <span class="a-text-bold">REDUCED MUSCLE FATIGUE: </span> wearing compression t-shirts during workouts, helps improve athletic performance by reducing fatigue. <span class="a-text-bold">A LOWER RISK OF MUSCLE SORENESS: </span> Compression shirts are a good option to reduce your risk for delayed onset muscle soreness. <span class="a-text-bold">BETTER MUSCLE OXYGENATION: </span> Compression garments are designed to increase the amount of oxygen your muscle receive which can enhance athletic performance during short bouts of exercise <span class="a-text-bold">MEASURE YOUR CHEST:</span> With arms down on side, take a snug measurement around the fullest part of your chest over the nipples. <span class="a-text-bold">HOW TO WEAR:</span> Hold both straps of the shirt and step into the garment. Pull up the garment and slide arms through armhole and adjust for comfort. <span class="a-text-bold">HOW TO CARE:</span> Wash in cold water, gentle cycle, tumble dry low or flat dry. No bleach, no iron.