Essential: The Harlem Cap by Carhartt WIP for men. The Harlem Cap by Carhartt WIP for men is an unreinforced, unlined six-panel cap made of cotton corduroy with eight ribs. With a fixed curved peak and adjustable strap with metal buckle, the accessory comes with embroidered ventilation eyelets and an embroidered "C" logo at the front. One size fits all