100% cotton. By buying cotton products from J.Crew Factory, you're supporting our investment in Better Cotton's mission to help cotton communities survive and thrive while protecting and restoring the environment; this product is sourced through a system of mass balance and therefore may not contain Better Cotton. Slim fit, cut more narrowly through the body and sleeves. Hits at hip. Machine wash. Size: Large Measurements are approximate: 20" flat across the front from pit to pit 26.5" length New with tags The color to me looks like a very deep navy blue but in some lights it appears black. Please see the pictures. A9