Montane's Prism sleeping bag uses leading edge Primaloft synthetic insulation to create a tough bag with a highly technical construction and laced with useful features that work.
Created for rough and tough conditions, the Prism sleeping bag was conceived for expeditions where high levels of moisture are expected, durability is needed and consistency of function is a pre-requisite, regardless of the sleeping conditions, or what the sleeping bag has been through. PRIMALOFT® is highly resistant to moisture and will maintain much of its insulation even when wet, whilst the PERTEX® Microlight outer shell is windproof, fast drying and highly breathable. One of the most technical synthetic sleeping bags on the market, the Prism has a tailored anatomical form and top stitch panelling across the body to prevent PRIMALOFT migration.
Comfort 5C / Comfort Limit 0C / Extreme -16C
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Montane's Prism Sleeping Bag is designed to be tough - but also to be a high performing synthetic bag. Primaloft insulation is widely recognised as being one of the best on the market and some of the features included in the construction of the bag would normally only be found in more expensive down bags.
Focussing on the things you can see reveals some really neat touches, the antisnag zip baffle finally looks like it works - Montane have stitched two small piped baffles the full length of the zip, these really do the trick and its difficult to see how the zip could possibly snag.
The footbox is interesting - its shaped to accommodate feet that are pointing into the air - assuming you are sleeping on your back - if this is you then it just might be the innovation you've been looking for - if you sleep on your side the bag will twist slightly to accommodate your feet - we're luke-warm on this as a feature.
We really like the inner fabric though - the 'PEAQ Down' lining fabric is still an out and out nylon fabric but it feels less clingy than the Pertex Quantum that you will find lining the lightest bags. The hood is well designed to give good coverage, more like a garment hood.
On the base of the bag Montane have added silicon dots to help keep the bag in place on your mat - these do make a difference, and inside the bag you have the mp3 pocket and a second pocket for a water bottle - both useful features.
So, if you are not buying the lightest sleeping bag in its class you are buying a very able bag which won't annoy you with jammed zippers, will feel more comfortable than some lighter bags and has a really good fit, from hood to collar to footbox.
- Reviewed by Ultralight Outdoor Gear
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Packed Size: The Prism comes with a rolltop stuffsack which has a narrow oval cross section 30cm at the widest point and 9cm at the narrowest. The bag can be stuffed in this and compressed to about 33cm long. If compression size is important to you you could buy a compression stuffsack and probably reduce this by about 20-30%.
EN13537:2012 - Look for the 2012 label for the most accurate rating; In 2012 the EN system of testing sleeping bags was re-vamped - the new testing procedures are more rigorous, producing more consistent results than previous tests. 2012 results tend to rate sleeping bags as poorer performing by a few degrees when compared to previous test results, even though the sleeping bag may be identical, or even better.
This means that comparison between an EN13537:2012 rated bag and an EN13537:2002 rated bag are particularly difficult - our advice is to use the new EN13537:2012 rating to compare with other bags who have also been rated in this way.