Verglas is really thin ice that often forms in north-facing gullies in the shoulder seasons, before you’re climbing in crampons. You only know it’s there once you hit it. You lose your footing, slip on the ice, and fall off the mountain. Qualified mountaineers have died on the Grand Teton because of it.
In 2008, DesLauriers became the first person to ski from the tops of all Seven Summits.