The Puma GWS sleeping bags have a Gore Windstopper shell because this makes them more water resistant and so you are less likely to get the down inside the sleeping bag wet - which would be a disaster.
Western Mountaineering says:
To some people winter mountaineering is just a pastime. Be it searching for an uncut bowl to tele, a frozen waterfall to climb or a simple visit to the Brooks Range, the Puma Gore Windstopper™ has been there, done that! This sizable bag is lofted with down and roomy to boot! 37 ounces of 850+ fill power down lofts this bag to a full 9″ for a rating of minus 25 below! A shoulder girth of 64″ provides room to layer, store clothing or fit to big folk. The inside foot section is sewn with a 2.4 oz. fabric to protect the bag while stowing gear. And the Reverse Differential Hood is roomy, down filled and warm, and totally made with Gore Windstopper™. The full down filled collar and both Interlocking Draft Tubes are also completely made with Gore Windstopper™ fabric. No place to cut costs! Few continents require anything warmer than our Puma Gore Windstopper™!
|V Side-Block Baffle|
|Interlocking draft tubes, Full down Collar|
|Gore Windstopper Shell|
|Highest Quality minimum 850+ Fill Down|
Western Mountaineering down gear has an awesome reputation in the US and that reputation is beginning to build on this side of the pond. Very high quality materials design and construction results in the lightest bags available for a given warmth.
An example of their attention to detail is their quoted 850+ fill power down used in all their bags: WM quote this figure even though their down generally gets higher ratings in official tests this is because they feel that the official pre-testing preparation enhances the down quality!
The Puma GWS sleeping bags have a Gore Windstopper shell because this makes them more water resistant and so you are less likely to get the down inside the sleeping bag wet - which would be a disaster. Our advice is that if you are using a two skin tent then you should not need the extra protection of a water resistant fabric - however if you are using a bivy or tarp or if you are going to extremely wet conditions we would recommend you take a water resistant bag such as this.
- Reviewed by Ultralight Outdoor Gear
|Help and advice:|
* Western Mountaineering state: 'We independently verify own temperature ratings through our own testing, customer feedback and design knowledge. Most of the items in our catalog we have been making for years, which means we have lots of prior knowledge from everyday consumers on what ratings are accurate. We have also EN tested our bags. In every case the EN rating is lower than our posted rating. This means our ratings are more conservative. We do this to ensure that almost everyone will be happy in our bags at the temperature we publish.'