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Best Winter Sleeping bags. Award winning and top reviewed  down and synthetic cold weather sleeping bags from Thermarest, Rab, Marmot, Nemo, Sea to Summit

Therm-a-Rest Questar 0 Down Sleeping Bag (-18C)
$391.97 $559.95 30% Off
Packed with features needed for cold-weather camping, the Questar™ offers supreme comfort and versatility. When you need feature-packed comfort for frigid backcountry conditions, it’s time to pack the Questar 0F/-18C. Thermarest has loaded this bag with the comfort features that Therm-a-Rest bags are known for. The Thermarest SynergyLink™ Connectors integrate the bag with your sleeping pad while allowing our Zoned Insulation to keep fill where you need it most. The fit of the bag has been perfected in our onsite cold chamber to create our W.A.R.M. fit that allows room for multiple sleep positions without compromising thermal efficiency. Stuffed with water-resistant 650 fill Nikwax Hydrophobic Down certified by the Responsible Down Standard, the four-season Questar is ready for your next backcountry adventure. The Questar is offered in three sizes, and designed to fit both men and women. Compression sack and storage sack included. Weight: 1.21kg / 2.67lbs Fill: 650 fill power Nikwax Hydrophobic RDS Down Fill Weight: 820g / 1.81lbs Bag Shape: W.A.R.M. fit
Rab Ascent 1100 Down Sleeping Bag - Women's (-25C)
$363.97 $519.95 30% Off
The warmest in the Ascent range, the Ascent 1100 is a 650FP duck down-filled, adventure-ready sleeping bag with a recycled Pertex® Quantum outer. Designed with a comfortable wide shape and women’s specific fit, it's ideal for those buying their first down sleeping bag for extremely cold conditions. The Ascent 1100 is an extremely warm bag with a comfortable, wide mummy fit. Filled with 1100g of 650FP goose down and with space for wearing additional layers if needed, this bag can be used in seriously cold temperatures. Ideal for winter use or even as high altitude, base camp refuge. The Ascent is built with a lightweight and durable, recycled Pertex® Quantum outer fabric and recycled nylon lining. It has trapezoid shaped, boxwall baffles that stack neatly together, encouraging the hydrophobic duck down inside to loft fully and reducing the appearance of cold spots. Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, maintaining the down’s loft and warmth. The women’s specific shape is slightly shorter in length, narrower at the shoulders, and wider at the hips than the regular fit bag for improved efficiency. The generous mummy fit with wide foot box provide a spacious feel for an easy night’s sleep, and the close-fitting neck baffle keeps the heat in when the temperature drops. It has a ¾ length main zip with a down filled baffle to keep out the draught. Practicalities are taken care of with an internal zipped stash pocket that easily fits a phone or a headlamp, a cotton storage sack and a compression stuff sack to ensure a manageable pack size and protection on the road. Exploring with a partner or want extra space? Pick up a left and a right zipped bag and you can zip them together. Bag Weight: 1.67 kg / 3.68 lbs Fill: 650FP European Duck Down with Nikwax Fluorocarbon-Free Hydrophobic Finish Fill Weight: 1.10 kg / 2.43 lbs Bag Shape: Wide Mummy
NEMO Sonic Down Sleeping Bag (-18C)
$729.95 - $799.95
Sonic is built to be the only bag you need from -20°F to 40°F. The Backpacker Editors’ Choice award-winning big-mountain bag offers exceptional warmth and tuneability with a reduced environmental impact. This bag features our next-generation Thermo Gill™ vents, with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine-tuning of comfort from within. Sonic’s chevron baffle construction better compartmentalizes down, eliminating migration and keeping the down evenly lofted. (Not to mention, it looks awesome.) The shell and liner fabrics are 100% recycled fabrics and bluesign® approved, and the premium 800 FP hydrophobic down is 100% Responsible Down Standard (RDS) certified. Years of history in the field yielded detailed upgrades on this bag, including a perfected profile, redesigned draft collar, and bolstered draft tubes. The proven Nemo Toester™ footbox keeps feet warmer, provides a waterproof barrier against tent wall condensation, and protects down from moisture while drying damp clothes inside the footbox. Adaptable to whatever the mountain throws at it, Sonic continues to reverberate as the ultimate extreme weather companion. Bag Type: Mummy Bag Weight: 1.47kg / 3.25lbs Fill: 800 FP PFC-Free, RDS certified hydrophobic down? Fill Weight: 790g / 1.75lbs Compressed Volume: 9.6L
Marmot Ouray 0 Down Sleeping Bag (-18C) - Women's
$297.47 $424.95 30% Off
Curl up in comfort with the Women's Ouray 0° Sleeping Bag. With 650-fill-power down plus a cinchable draft collar to prevent heat loss, this sleeping bag is built for overnights in temps down to single digits. The women-specific cut keeps warmth where you want it, and dual-side zips make it easy to climb in and out. Looking for more room? Open the footbox for space to stretch or zip it up for extra warmth. Unzip the extended zipper flaps on extra-cold nights for blanket-like coverage. Bag Weight: 1.74 kg / 3.84 lbs Fill: Down defender, 650 Fill Power, Duck Down Fill Weight: 1.09kg / 2.41 lbs
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