Hat Lightweight synthetic or wool cap that provides warmth and fits comfortably under a climbing helmet. “i\'m particular about choosing a hat, because on a long expedition, I wear it for weeks at a time. Here\'s what I look for: low profile, merino fabric, medium weight.” \r\n- Peter Whittaker\r\nBuff Versatile, soft wool or synthetic fabric that shields the face, neck and head from every element and feels smooth against your skin. “I love my Buff®. It protects me against everything from sunburn to frostbite. It’s versatility means that I can cover my face on windy days, protect my neck from the sun and pull it all they way over my head when things get nasty.” \r\n- Seth Waterfall