An iconic Kangol classic, with the Ventair pattern around the outer edge, the 504 Ventair Cap has remained fresh since it was introduced in the early '80's. The 504 cap gets its name from the number assigned to the original block shape on which it was made. Tropic yarn is Kangol's traditional polyester blend, and is a warm weather yarn that has been a staple in the collection since the 1970's.