Prepare yourself for any weather on your shoulder season hike by zipping up the Marmot Minimalist jacket. Start the day out with just the internal Thermal R liner jacket keeping you warm, as you head to the peak and those storm clouds get closer pull the ultra packable Gore-Tex shell out of your pack for protection from the precipitation. That Gore-Tex shell is super breathable to prevent you from overheating while you hike and weather resistant to keep you nice and dry despite the rain. Additionally the Thermal R liner traps your body heat for maximum warmth as the temperature drops later in the evening. .