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SOL Thermal Bivvy

rated 4.5 of 5 stars
photo: SOL Thermal Bivvy emergency shelter

Turns a light summer bag into an impromptu "colder weather" bag. Very compact, lightweight, and easy to use. Durable, and it's NOT a mummy style for us larger guys/gals.


  • Seemingly very durable
  • Compact and lightweight
  • Will fit over most full size bags
  • Water/weather resistant
  • Opens at feet for ventilation


  • Velcro tabs could be sturdier/closer together
  • Used as a stand-alone, condensation can be a factor

On a recent summer outing with my son, I made an egregious rookie mistake when packing and did not account for a "cold snap" that was moving through the area. While low temps had been in the low/mid 60's F for awhile, on our trip they dipped down into the high 30's and low 40's for several nights. I had only brought my Coleman light summer bag (generously rated at 50 degrees), no jacket, and no other blankets. Mistake...huge mistake.

After getting virtually no sleep the first night (low 40's), grumpy and cold I remembered that I had an SOL Thermal Bivvy in my trunk (bought in 2016) for emergencies and my demeanor improved greatly. I put my Coleman bag inside the SOL Thermal Bivvy and the remainder of my outing was toasty and warm, even with temps. dropping into the high 30's.

My son moved into my Alps Mountaineering Chaos 3-man tent from his hammock to share body heat (which helped), but I'm convinced the Thermal Bivvy added at least 20 degrees to my Coleman bag. With two of us in there, condensation became an issue, but was still warm the remaining three nights.

I'm a fairly large person (6'2", 230) and very much appreciated the roominess of not having a mummy style bag, but had an issue with the Velcro tabs coming apart several times in the night. At the end of our trip, it was very easy to repack the bivvy and put it back in its sack.

I made a stupid rookie mistake despite my years of camping experience, but my SOL Thermal Bivvy saved the trip from being miserable. I'm gonna get another one (SOL Bivvy) and make it an integral part of my gear for EVERY outdoor excursion I go on.

Get one... toss it in your trunk/glove box... cause you never know.....


Bought it in 2016 for emergencies. Tossed it in my trunk and have used it once for three days as an augmentation to my Coleman summer bag. It saved an outing.

Source: bought it new
Price Paid: $25

The SOL Thermal bivvy is an excellent addition to a 40-degree sleeping bag when temperatures drop and you want to add about 20 extra degrees. The bivvy is lighter than the lightest sleeping bag liners of the same temperatures. The soft material on the inside and out holds up to everyday use and doesn’t make a lot of noise like other survivor blankets.


  • Great material
  • Very lightweight
  • Very affordable
  • Packs small
  • Versatile


  • Makes you look like a baked potato.

 By placing your sleeping bag inside the bivvy you turn a cool weather sleeping bag into a cold weather bag.

If the bivvy is ripped or torn the price of another is not going to break the bank at $29.95. On the off chance there is an emergency, it is a survival blanket. 


I have been using the same one for about four years now and have only slightly modified it to my specifications.

Source: bought it new
Price Paid: $29.95

With this bivvy sack, I turned a synthetic filled Wenzel mummy bag, rated around 30 degrees F into a really cozy mountain sleeping bag.

I slept inside this combination in a winter expedition at around 5800 feet in last December. The temp was 17 degrees outside the tent and no part of my body was cold during any of the two consecutive nights.

I also used the bivvy without additional sleeping bag in last summer, it had again done the trick, although I awoke towards the moning  shuddering a little because I was somehow half way out of the bag. Stitching around the velcro should be sturdier, though.

All in all, I recommend this bivvy to any hiker, backpacker, biker, etc.

Price Paid: $26.50

Here's my review of Adventure Medicals' Thermo-Lite Bivy:


I would agree with Arson's very thorough review. I defer to his review and would recommend this product. It does work.

Price Paid: $26.94

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Price MSRP: $29.99
Current Retail: $30.00
Historic Range: $15.89-$36.99
Reviewers Paid: $25.00-$29.95
Package Size 84 x 34 in
Package Weight 8.9 oz
Product Details from SOL »