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Measure around the waist at the belly button.
BTU, 88% polyester, 12% spandex 4-way stretch heavyweight brushed fabric with high compression fit/ Self-material crew neck/ Technical cut shoulder insert/ Flat lock seam throughout entire shirt/ Double needle hemmed arnhole amp; bottom strongPlease see this similar product, a href"https://champrosports.com/product/2629/cold-weather-2-0-compression-long-sleeve-shirt"CWCJ01/a, if inventory on this product is low
