If you are a side-sleeper than the ‘spoon’ shape of the Nemo Disco 15 may appeal. Contouring gives this sleeping bag plenty of extra room around the knees and elbows, and it is a very comfortable bag for sleeping on your side. It certainly feels spacious, allowing plenty of flexibility for movement.

Rating: 3/5 | Price: $300 | £319.99 | Available from: Alpine Trek | Weight: 1250g (size Regular). | Fill: 625g of 650FP hydrophobic RDS duck down. | Shell: 30D Nylon Ripstop | Zip: 2 way, 3/4 length | Length: 198cm (size Regular). | Rating: Comfort -4°c | Sizes: Regular/Long. | Women’s version: Yes

More info: nemoequipment.com

It is also feature-packed. The footbox is protected by waterproof material with a higher ripstop denier rating than the rest of the lining. This does a good job of stopping your feet getting cold if they are pressed up against the wall of a damp tent. The hood includes an open pocket which can be filled with either a cushion or clothing for head support. Two long zipped slits are included on the front of the bag for ventilation. These could be handy if you are a warm sleeper, and they are good at letting heat out, but very little cold air in.

Unfortunately, I found these zips to be fiddly and very prone to snagging. Thankfully the main zip includes a zip ‘plow’ which does reduce snagging. An unusual feature is the Blanket Fold – a rectangle of insulated material which acts as an external draft collar. You can make it work reasonably well but I found myself having to adjust it regularly to be effective. I suspect this may be a ‘marmite’ feature – personally I would have preferred an internal draft collar.

The Nemo Disco 15 has a comfort temperature rating of – 4°c is given, but I found myself getting cold around my knees and legs quite easily, which is a potential down-side of the bag’s spacious design. Even whilst using a sleeping mat with a high R rating, I would be reluctant to use this bag in temperatures below 0°c again. If you are a warm sleeper then you might be fine in milder winter conditions, but in general I’d think of the Disco 15 as a 3.5 season bag, rather than a 4 season one.