4.5 oz. (153g), 100% ring-spun cotton, pre-shrunk soft enzyme washed jersey fabric. RS Sport Grey: 90/10 ring-spun cotton/polyester. Graphite Heather: 50/50 ring-spun cotton/polyester. Other Heathers: 65/35 ring-spun cotton/polyester. Fiber content varies by color. Adult:  XS, S, M, L, XL, 2XL, 3XL, 4XL, 5XL