The Kangol Tropic 504 Ventair is an ivy cap that features the Tropic yarn for a lightweight & comfortable fit. The Ventair pattern around the outer edge is an iconic Kangol classic. The 504 cap gets its name from the number assigned to the original block shape that it is made on. The Tropic yarn means that the hat is both lightweight & comfortable. It does have some hard to see discoloration that I tried to capture in photos.