The Dome P 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, effective yet humble. It's why Mountain Hardwear dome hats have been favored by alpinists and big-wall climbers for a quarter of century and counting. Fit & Design: Uses: Superlight Backcountry Skiing, Alpine Climbing, Rock Climbing, Running / Training, Backpacking / Hiking, Camping Snug fit for use under a hood or helmet Redesigned low profile dome shape Full ear coverage Technology: Polartec(R) Windbloc(R) fabric blocks 100% of wind offering maximum protection from the cold and the elements