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Tommy John features the most comfortable undershirts on the planet. We use only the finest, most luxurious stretch fabrics available and have changed the men's undershirt category with our patented Stay Tucked tapered design. Our undershirts are form fitting, but are never restrictive to wear. The Second Skin V-Neck is the ultimate men's undershirt. The light weight fabric is the perfect blend of micro modal and spandex to give you a form-fitting, non-pilling shirt that moves with you instead of against you. Reengineered with our lay-flat, stretch rib collar, this tshirt will not stretch, giving you a "new vee" look for years to come. 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.