The XKG Transition Flex Jacket features a combination of lightweight stretch nylon and Thermolite insulation to deliver a mid-weight insulating layer for your XKG system. The Thermolite insulation offers impressive levels of warmth and quick drying time. Paired with the stretch outer fabric, the jacket is filled with 130 GSM insulation in the body and 100 GSM insulation in the sleeves for easier, less bulky layering and better range of motion. The soft and air-permeable outer nylon fabric allows moisture to escape. DWR coating protects from light rain and mountain snow. The XKG Transition Flex Jacket is a versatile piece that is indispensable for anyone active in the outdoors. Stretch Nylon Outer Fabric Thermolite Insulation - 130 GSM Body & 100 GSM Sleeves DWR Water Resistant Coating 2 Chest & 2 Side Hand Pockets Low Profile Cuffs Product weight: 17 oz.