A very lightweight cap with a removable, adjustable skirt that gives you shade from harmful sunrays and can be popped off when you just want a baseball type cap. The peak is very large and stiff, giving great shade, although it can cut into your vision rather a lot. Mesh side panels give plenty of ventilation and the lightweight fabric provides UPF 30 sun protection. The whole thing is very compact when not being worn. Designed for runners but could be equally applicable to expeditions. ca 79g.