RMI and Whittaker Mountaineering Gear Guides Mount McKinley Expedition | Page 21

Light Insulation (Layer 2) Light weight with or without hood. Lightweight enough to work out in and with just enough material to combat the cold. What is Light Insulation? This layer adds a bit of warmth to your system, while maintaining breathability during heavy exertion. Medium Insulation (Layer 3) Preferably with a bit of wind and water resistance. Can be worn over the lightweight layer. What is Medium Insulation?\r\nThis heavier insulating layer adds increased warmth, and a bit of wind or weather protection. There are many suitable materials and styles including soft shell jackets, fleeces, and down or synthetic sweaters.