Down' Synthetic' Synthetic' Down' That's the question most of us wrestle with before we buy a sleeping bag, and both forms of insulation have serious benefits. Kelty's making the decision a little easier by combining both in the Dualist 20 ThermaDri Sleeping Bag, a lightweight, water resistant, and toasty bag for three season adventuring. By using water resistant 550 fill DriDown on the outside and warm, durable ThermaPro synthetic closer to your body, the Dualist achieves a combination of warmth, water repellency, breathability, and packability that a traditional down or synthetic bag can't match. The DriDown lofts quickly to trap heat and increase vapor transfer, and the total fill is 20% lighter and 40% more packable than classic synthetic. Kelty hooked the 20 degree rated Dualist up with an ergonomic Thermal Comfort hood and Natural Fit footbox to keep your head and feet warm and comfortable, and it included a drawcord draft collar and anti snag zipper draft tube as well, so your warmth stays in and cold air stays outside where it belongs. The full length zipper lets you nail the perfect temperature during your shoulder season backpacking adventures, and the included stuff sack keeps your bag safe when it's in your pack or sitting at home waiting for your next trip.