Best for alpine and winter use

Plusses: Water-resistant fabric and down, long zip, excellent hood and neck muff. 

Minuses: Long for its size.

Features: This alpine-oriented bag has trapezoid box wall baffling filled with hydrophobic down and a refined mummy shape. A lofty hood and generous neck muff point towards cold conditions and open-air bivouacs, while water-resistant Pertex Quantum Pro fabric adds protection. 

Fit: It’s a large bag. I’m 1.76m tall and a regular swallowed me up. I’d recommend it for people around the 1.8m mark, and the large size if you’re taller. 

Comfort: In sub-zero conditions and a cold wind I appreciated the bag’s well-built plushness. It’s cosy, with a thick hood and generous anatomic neck muff, and the width was spot on – it was just too long.

In use: The Neutrino is a refined bag. It has a no-catch zip and locatable and user-friendly hood toggles. It’s designed to be easy to use without faffing around in the dark. The water-resistant down and shell combine for a bombproof feel that is damp-shedding and comfortable through the night. It can be unzipped to the ankles and used as a duvet during hut nights.

Value: For its warmth rating, the Neutrino Pro 500 is at the upper end of the price range, but it stands apart for water-resistant fabric and a durable build.

Verdict: For above the bushline and winter use, especially in tents and bivouacs, this sleeping bag is a great choice. It’s refined, well made and comfortable.