Purchased March 2025 Only tried on Will be shipped compactly. The front uses Airshell nylon micro-mesh. It has excellent breathability and elasticity, and is finished to be ultra-lightweight. Monofilament mesh is used on the back to reinforce the structure and ensure breathability. The spacer mesh headband controls moisture. The foam brim is easy to store and lightweight. It can be easily stowed in a pack or pocket. Ultra-lightweight and comfortable to wear, it's great for everyday use, but it really shines in trail running, high-load hiking, ski touring, and steep approaches.