Simplicity has always been their guide to the mountains - and their focus for designing headwear for high-alpine environments was no different. The Dome Perginon™ is engineered to work with your helmet, so it fills a gap in your kit without complicating the rest of the system. It's sleek yet notable. It's effective yet humble. It's why the dome hats have been favored by alpinists and big-wall climbers for a quarter of century and counting.