Galvin Green Astro Waterproof Golf Bucket Hat FEATURES AT A GLANCE 100% Waterproof Windproof Extremely breathable Lightweight BLUESIGN® approved  fabric Elasticated sweatband GORE-TEX Paclite® Technology Made from: 100% polyester with ePFTE membrane. About Gore-Tex and why it is guaranteed to keep you dry The Gore-Tex membrane contains over 1.4 billion microscopic pores per square cm. These pores are 20,000 times smaller than a water droplet, but 700 times larger than a water vapour molecule, which makes the Gore-Tex 100% waterproof from the outside, while allowing perspiration to escape from the inside. The result is an ideal garment for golfers. Garments from the Galvin Green Gore-Tex range are guaranteed to keep you dry, even in the...