4XL - Men's henley made of 8 oz. 57% cotton/38% Poly/5% Spandex. A "slub" used to be considered a flaw, then someone figured out that repeating the faint white marks in a uniform way created interesting and fashionable texture. It's just enough to break up the solid color and not enough to detract from your logo. The cotton exterior has the attractive slub look, while the interior has soft moisture management poly against your skin. Made in the USA.