What Our Gearhead(R) Experts Are Saying:"I use the Corus when I want to move freely at night without losing warmth. The strap system keeps the quilt anchored to my pad, and the footbox does a great job sealing out drafts. It packs down smaller than most sleeping bags I've carried on similar trips."We pull out the Corus HD Quilt when our backcountry nights call for a balance of warmth, comfort, and the freedom to move naturally. Therm-a-Rest builds the quilt with 650-fill hydrophobic down and box-baffled construction, giving us efficient insulation that spreads evenly and avoids cold spots as temperatures dip toward freezing. The quilt's open layout feels closer to a comforter than a sleeping bag, making it ideal for warmer three-season adventures or as a flexible layer in colder setups. A thoughtfully shaped footbox can slip over a sleeping pad to block drafts or wrap around our feet when we need extra warmth. Full-perimeter side baffles and a snap-closure neckline help seal in heat on chilly nights, while removable SynergyLink connectors secure the quilt to a pad without restricting movement. Soft, PFAS-free recycled fabric rounds out the design, offering a comfortable next-to-skin feel with packability suited for longer routes.