For warmth when you need it and lightweight packability when you don't, add the Arc'teryx Rho Lightweight Beanie to your kit. It's made from ultra warm merino wool, with a double layered headband for that warm and toasty feeling.
Mountain Merino Wool – 95% Merino Wool / 5% Elastane
Double Layered Headband for Warmth
Embroidered Bird Logo on Side