It might be a band, but it's also the way time is marked in Fourth Edition Dungeons and Dragons. This is useful Goddamn information!
Product Details:Size Chart
Male model is 5'7" and wearing a men's medium
Female model is 5'7" and wearing a women's large
Men's printed on Port & Company, 100% cotton, black t-shirt
Women's printed on American Apparel, 100% cotton, purple t-shirt