The Polar Ranger -20F/-30C Sleeping Bag is packed with down and other well-planned features to keep you toasty in sub-zero temps. Thermarest have designed the Polar Ranger in collaboration with Eric Larsen - known for reaching all three 'poles' in one year.
Packed to the baffles with useful features
Overlapping Side Vents open to allow arm use for carrying out daily tent-based tasks from the warmth of your down-filled cocoon, they double as useful vents too for temperature regulation. This bag is a truly spectacular sleep sack built for the most intense expeditions, but don't just take our word for it, check out Eric with the rundown on the 2018 Polar Ranger: