Looking inward and deciding to improve their most recognizable hat and take it to the next level, Kangol 's Tropic 504 Ventair is an example of simple improvements for huge impact. The Tropic 504 Ventair from Kangol uses the company's "Tropic" fabric - a blend of acrylic and polyester - along with its Ventair pattern to give you a lightweight, breathable hat that's perfect for the warmer seasons thanks to the overall cooler feel. However, these changes have hardly affected the iconic lines and recognizable style of this flat cap, so you can still sport the look you love with your Tropic 504.