For the minimalist who doesn’t want to sacrifice comfort in the alpine, the Rab Neutrino Pro Sleeping Bag has a little bit of everything to help you stay warm in unrelenting mountain environments. Using only the highest-quality materials, the Neutrino Pro boasts a small packed size and ultralight weight that make it easy to carry — which is especially nice while backpacking or mountaineering. The 800-fill RDS certified down insulation lets you cozy up to your bivi ledge comfortably knowing that you’ll be toasty warm when the temperature drops. In case you decide to sleep under the stars, the Quantum Pro face fabric is wind- and weather-resistant and the down insulation is treated with Nikwax so you stay warm even in damp conditions.