When specifying our new crew caps, we chose the "top-spec" options all the way. So the bulk of the cap is made from strong, 100% cotton twill material, with a sweat-resistant hem and reinforcing sewn around the inside. The brims are plastic (not cardboard), and covered in soft fawn-coloured suedette on top with navy covered twill beneath (to reduce glare on the eyes). The size-adjusting strap has a metal buckle, and metal sleeve for tucking away the end neatly. Each is heavily embroidered with a crew position in cotton thread. The quality is excellent as is the price.