MOST COMFORTABLE TANK TOP ON THE PLANET - We use only the finest, most luxurious stretch fabrics available and have changed the men's undershirt category. PATENTED STAY TUCKED DESIGN - This undershirt will never come untucked thanks to our patented long, tapered design. The length both keeps the shirt tucked and prevents EFG (excess fabric gut), keeping you looking your best. THE PERFECT FIT - Designed to fit your body and not a box, Tommy John's Air Mesh tank fits your body from shoulders to waist. Our undershirts are form fitting, but are never restrictive to wear. MEMORY COLLAR PREVENTS BACON NECK - Reengineered with our lay-flat, stretch rib collar, this tshirt will not stretch, giving you a "new tee" look for years to come. SIZING MADE EASY - Our sizing is measured by chest size. Measure under the arms and across the fullest part of the chest apex including the lower portion of the shoulder blades. Small fits 34-37" chests, medium fits 38-41". large fits 42-44", XL fits 45-48", and XXL fits 49-52" chests.