Durable lightweight storm protection with Diamond Fuse Technology, served up in a packable waterproof full brim hat. "Best rain hat on the market" The durable lightweight superpowers of our Helium Rain collection, now offered in a full brim hat to ward off wet weather and abrasions. Completely seam-taped, waterproof, yet still breathable and comfortable in rugged conditions, the new Helium Rain Full Brim Hat will be the first thing any hiker, peak bagger, or off-trail adventurer will pack for the most durable lightweight rain protection.