Thermarest Boost sleeping bag?

Fireblade

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Has anyone experience of the Thermarest Boost sleeping bag?
I’m shopping for a new down-filled 3-season bag, and the Boost’s comfort features (expansion zip, armholes) look interesting. I already have a serious winter bag, so this is to cover the warmer months.

Boost
 
You have lots of good options in that price range.

I use my Helium 250 for 3 seasons. Which looks to be nigh on the same specs as your option.
 
I have the thermarest Hyperion ( the one rated to -6º) and it superb and packs up so small so I would imagine the one you are considering is pretty good
 
You have lots of good options in that price range.

I use my Helium 250 for 3 seasons. Which looks to be nigh on the same specs as your option.
I have the same and a silk liner adds 3 degrees, some clothing adds more if required. But I prefer very light and add if needed
 
thanks folks.
I've got a lovely -18C bag for winter duties. Originally I was just going to get a standard down mummy bag, but It looks like there's new thinking in the world of sleeping bags.
The idea of a bag that can either have wriggle room or be cinched down for warmth is intriguing.
Armholes too - reminds me of my old Ajungilak Igloo Twin which has cords you can tie over your shoulders, so you can sit upright and stay warm. I bought it after nearly freezing at a northern England bike rally 30+ years ago. I've still got it, but packed down its still massive.
 
I have the same and a silk liner adds 3 degrees, some clothing adds more if required. But I prefer very light and add if needed
Me too, the warm clothes I wear around the evening campfire add a season to the bag (which can therefore be smaller / lighter). I like my Buffalo mountain shirt for that.
 
Belated update time. I decided to buy the Thermarest Boost bag, the -6C / 20F version.

Tested it on a 3-week camping holiday, in coastal BC, Canada, in May. There were plenty of chilly nights, as well as the occasional warm one.
The bag was great. The additional space you can get by opening the central longitudinal zipper really makes it comfortable, especially for a side sleeper like me. On a couple of cold nights I zipped that one up for extra warmth, which worked a treat. The armholes are useful either for extra ventilation when it's warm, or to let you rummage for your torch/phone/glasses without getting out of the bag.
I particularly liked that I could get a short bag, it's just big enough for little 168cm/5'6 me, and I'm not carrying round an extra 6" of sleeping bag that my toes will never reach the end of!
It packs down much smaller than my previous 3-season synthetic bag, it's just as warm, and it's more spacious. Recommended.
 


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