KANGOL Tropic 504 Ivy Cap - Mens Light Flat Driving Summer Hat 0287BC Classic Iconic Kangol classic, clean and crisp. The 504 cap gets its name from the number assigned to the original block shape that it is made on. Tropic yarn is Kangols traditional polyester blend, warm weather yarn that has been a staple in the collection since the late 1950s. Please contact your local customs office for further information.