Hats and beanies

For sports and movement, reach for a thin technical one that wicks away sweat and will not slip; for rest and frost, go for a thicker woollen one. Merino and fleece keep you warm even when wet, acrylic is cheaper but cools you down when sweating. A hat belongs in the mountains even in summer: above the tree line, the weather changes within an hour and it gets cold in the evening even in August. Check if it fits under a helmet if you climb or cycle.