Used in deep cold and works from a temperature point of view. Used between -10 and - 35 and works. It is a huge bag even when compressed and takes up a lot of the main compartment. I felt it was a little short for a 6'3" with the baffle interacting with the top of the shoulders. There is enough room for a semi closed larger person to be comfortable but if you need to fit gloves, hats, headovers, mitt liners etc it can be quite tight. The zip was not of good enough quality in my opinion. It moves up and down under pressure and does not 'hold' if you leave it open say 20 cm. It will shift up or down to its own preferred position. Also feels a little under strength for long term use under pressure. The central zip is good for sitting up and dressing or drinking etc whilst in the bag. Be VERY cautious in choice of bivvy bag as it is in my opinion a disaster to use without a bivvy that also has a zip. A cheap Nato bag may be generous but really there is too much sausage to get in the skin if you are using a rectangular mat and the bag. Much more pleasurable to use when I got a central zip bivvy paired up with it. Reasonable-ish price for a deep cold bag. So better if you are a smaller person than a larger person but I am sure there will be others who think differently.

By far the warmest sleeping bag I have ever used. This sleeping bag proved warm even in somewhat damp conditions. It is, understandably, rather bulky and not the lightest, although I was surprised by how light it is given it's size. The zip is actually quite substantial in comparison to those on other sleeping bags I have but initially appears a bit puny in comparison to the bulk of the bag itself and it works well. With the extra space afforded to me when travelling by canoe it will definately be on the kit list. Even travelling on foot I would tend to take it because I like the comfort but It probably isn't worth taking for short trips where packing light is a priority or when it is going to be consistently warm. I used the same sleeping mats and sleeping bag liner as I have done with my previous sleeping bag so the comparison is directly between sleeping bags.

The Canada Jay is an awesome 5 season sleeping bag. It's extremely comfortable and doesn't feel restrictive. The central zip is a superb feature, making a huge difference to getting dressed and preparing to leave the bag on cold mornings. It dries/airs out quickly and fits nicely into the stuff sack provided. It's very lightweight and wraps thoroughly around your body, superb when inside a bivvy. This will accompany me to every cold place that I visit, for as long as I have it. An absolutely essential component of my cold weather sleeping system.

Bought this for husband to use in Norway in Jan/Feb, sleeping outdoors in temperatures down to -35. He said the chest strap and hood cords stop any wind/cold getting in, it is light enough to hook on his kit bag without weighing him down further and 'it's the best thing I've ever bought him' so that seems to sum it up.

In the snow, we just had over the past week, was a perfect opportunity to try out my new bag, bivvi and mat. The system performed well and I slept with it 2/3 done up as it wasn't cold enough to snuggle right in. I have been looking for a 'mummy' style dos bag since leaving the army. So when I found this I had to upgrade my existing (perfectly good - going on ebay good) bag. I feel that the price is a bit high but then saying that I still bought two!!

The Polar Bear Sleeping Bag is an incredible product. I slept in this in October in a cave in the Lake District, UK, and it was so warm I had to leave the zip open to allow air in. It is incredibly comfortable and the inner pockets proved useful for storing my headlamp so that I could easily find my way out in the night if I needed to get up for anything. I can highly recommend this to anyone that is planning on exploring nature from autumn through winter. The only downside is how hard it is to get into the provided dry bag, even when compressed. I was worried that the amount of force I was applying would damage the sleeping bag. Alas the manufacture quality stood up to the challenge and eventually I got the sleeping bag into the dry bag. I will be swapping the dry bag for a slightly larger one so that I can more easily pack it when out in the field. The storage bag provided for the uncompressed storage is a thing of beauty and really completes the product. Amazing sleeping bag, I would definitely recommend this!

This is the second one of these I've bought from Woodlore. It has good features like the central zip and inside pocket, and is very warm. I have used it in very cold conditions (-30c) and am still typing. Be aware though - you'll probably fine it too warm for year round use. I don't go along with the whole "if it's too hot open it up and use it like a duvet" thing, bits of me get cold or wet and clammy. Price wise, it is excellent value. It is nice and soft although it doesn't have the fluffy puffy feeling of a down bag - however, the upside is that it can get wet and the fibre inside doesn't turn into a wet lump of feathers. The zip on my old one catches on the material beside it, which is utterly tedious. Anyway, I've still come back for more so it's not such a big deal evidently. Yes, I do recommend and as usual Woodlore standard of service sets the bar for other companies to aspire to.

I Bought your Arctic Sleeping bag to go to Northern India in search of snow leopards.
Whilst Camping the lowest temperatures went down to -16C, the bag was brilliant, I even had to strip off it got so hot.
For Home stays the coldest temperatures were -23C, still brilliantly warm, no complaints at all.
The only issue was the zip kept coming apart once it was closed. Every time I managed to pull the closing mechanism down below the opening, clearly not ideal in the kind of temperatures I have mentioned.

Bag is great quality and although I cannot comment on how it would perform at serious sub zero temperatures, I can testify that it was seriously toasty on a boat when the temperature caused the water in the coffee machine to freeze solid. So much so that I needed to open it up too cool down. I have no doubt that this bag will keep you warm in seriously cold conditions. Just need to be a bit considerate when using the zip. Also I would say if you are over 6 feet tall it would be too short for effective use in extreme conditions and it is pretty bulky. Would recommend a Norrona Recon pack if you need to pack it. All said though this is clearly a great piece of kit and the price is great for the specification you get. Great service as always.

It is actually a bit heavier than the goose down filled equivalent but once in position it is fabulous. I only managed minus 10 Celsius camping in Ladakh last winter and I felt too warm.
It is obviously capable of withstanding much colder. It is such amazing value for money I was wondering 'what must be wrong with it?'. I was a little hesitant to buy it at first, but I haven't found anything wrong yet. Very robust construction, a real hidden gem.

Overall a brilliant piece of kit, it contains quality materials it is also very light. However with a few issues. The biggest issue is the collar. It is not possible to fully pull it tight and there is a small space where all the heat escapes. I personally had to adjust/move the Velcro on the collar. Then there is the Velcro that rips the fabric. And the -35 comfort is not accurate. Possibly when fully clothed and out of the wind. That however differs form person to person. Otherwise a good sleeping bag.

I'm happy we had a harsh winter - it was a stable -20 all winter here in Quebec. I experienced the -30 and the -40s for the first time in my life for multiple days. This bag is awesome; if it's too warm and you sweat, it wicks away all your condensation humidity from the sleeping bag, so it keeps you dry and warm. It is a very comfortable piece of kit, very light, and you can take advantage of the central zipper when other sleeping bags open only on one side. I love it.

The only problem is around the velcro; it wears the fabric, so you've got to be careful not to have it grip on the sleeping bag fabric. Anyway, it did the job I expected it to in cold weather.

In my opinion, in very cold weather, I would rather use a wool blanket instead of a bivvy, as it keeps you warm and dry since it's more breathable. Thanks Ray; I had a blast this winter.

Decided to sleep out last night to test my sleeping bag. Went between Beer & Branscombe along the seafront cliff top walk down in Devon. Used a bivi, sleep mat, sleeping bag & cotton liner. Made a nice cuppa on my esbit pocket stove, then heated some more water to use the water bottle as a hot water bottle. Checked my digital temp & outside went to -1 whilst I was a cosy 25 in my sleeping bag. Got a bit too warm so had to let some heat out.
Overall I am very impressed with my purchases. Definitely better than my old sleeping bag that I got off eBay for £30 so you do get what you pay for.

This is a solid piece of kit! It's not as heavy as it looks or as described but it sure is as warm. I've only field tested this twice: once at -9°C and the other at -12°C but both times I was totally warm with only a sleeping mat and my bivvy. I highly recommend this bag.

I find the Canada Jay Synthetic sleeping bag to be one of a high standard of quality, it is very comfortable, and there's not many synthetic sleeping bags that you can use safely when the weathers goes to a cold -20 degrees comfortably.

This sleeping bag really made me realise the difference between spending £200 from a previous £50, and for me, I would say its worth every penny. Haven't tested it outside yet, but used indoors at 4c and its so snug and warm. Really can't wait to get outside and test it properly.

Made of the very best material and very well designed, this is the bag you want in sub-zero conditions.
Despite ordering it too close to Christmas it arrived well-packaged within 2 days.

I have just field tested this quality bag down to a chilly -11 degrees on the North Yorkshire Moors, prior to deployment. To put it through its paces I only used a summer sleeping mat, no bivi bag and slept in a base layer in the open. What a great bag!! easily warm enough. The only thing that irritated me was the para cord main zip extention, which can dangle in your face with the zip done up, once removed problem solved! This bag is a little bulky but it offers a lot of protection and is roomy, I prefere synthetic after having a nightmare with a down bag that got wet and froze. A lot of very warm sleeping bag for the price. Woodlore strikes again with quality kit!

Having slept in a winter bag with a zip that broke in the middle of the night in minus 25 myself, and seen it happen to friends in the Norwegian mountains in winter, I was a little wary of this one at first, but it has proven to be a very stable and strong design. I have slept out many winter nights in Sweden with it and found it roomy, comfortable, and up to the job. All in all, warm and a great piece of kit - Norwegian know-how and Ray's experience are a pretty good combination! As always, the right insulation from the ground makes a big difference to how toasty you will be, but as long as you get that right this bag won't let you down.

Like all Ray Mears gear, this item is of a high standard. The warmth factor is more accurate than the normal bag manufacturers, which means it is very warm. I slept in this in the winter in the middle of a wood with no fire and was plenty warm and had a nice nights sleep. Couple this with a sleep system and you will not want to sleep in anything else.