Light Insulation (Layer 2) Light weight with or without hood. A Pacific Northwest fall running layer - lightweight enough to work out in and with just enough material to combat the cold. \\r\\n\\r\\nWhat is Light Insulation? This layer adds a bit of warmth to your system, while maintaining breathability during heavy exertion.\\r\\n\\r\\nMedium Insulation (Layer 3) Preferably with a bit of wind and water resistance. Can be worn over the lightweight layer.\\r\\n\\r\\nWhat 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.\\r\\n