The Tropic 507 Ventair is a sleek, modern cap shape with curved side panels to create an ergonomic fit. The iconic Ventair pattern is added around the crown. The 507 is a perfect blend of the classic Kangol® cap and the cut of a baseball. Knitted stretch comfort fit sweatband. The modern and elegant shape of the Kangol cap with curved side panels that create an ergonomic fit. Tropic yarn is Kangol's traditional polyester blend yarn, ideal for warm days, which has been a staple of the collection since the late 1950s.