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Designed to let you sleep like your bed at home, the Zenbivy Bed is the world's first freestyle sleeping bag.
Designed to let you sleep like your bed at home, the Zenbivy Bed is the world's first freestyle sleeping bag.
434 backers pledged $120,648 to help bring this project to life.

EN Test results are in........

Posted by Michael Glavin (Creator)
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EN Testing Results

The Institute for Environmental Research at Kansas State University has completed our testing for the EN13537 standard.  Our acceptable range for the EN limit rating was 22-28 degrees F. Actual results:

EN Limit Rating:  23 degrees F, 15 degrees C

EN Comfort Rating:  34 degrees F, 1 degree C

What does that mean?

There is a lot of misinformation about how to use the EN ratings system, mostly driven by REI who shows the comfort rating as a "womens" rating, and the limit rating as a "mens" rating. This is not correct or how the EN system is meant to be used. Here is what you should really expect:

Limit rating:  This is the point where the average sized man, sleeping in a curled position, is at the limit of their comfort.  By definition, this is not "comfort", but the "limit of comfort".

Comfort rating:  This is the point where the average sized woman, sleeping in a natural relaxed position, is able to sleep comfortably.  This is "comfort".

The purpose of the EN standard is to give you a range, since bigger people tend to sleep warmer than smaller people, women and men are simply used to create the range. Your individual body mass, metabolism, what you ate the night before, etc, will determine how warm or cold you sleep; despite common perceptions otherwise, your gender has nothing to do with it.

My advice is to simply ignore the much-more-common Limit rating, and simply use the Comfort rating. The Zenbivy Bed is designed to keep most people warm and comfortable (if you are at your limit, you are by definition not comfortable), down to a little below freezing. In a practical situation where nighttime temps are freezing, you are likely to have insulated garments (a down puffy) that is NOT part of the EN test, but WILL be in your kit on cold trips. When combined with a down puffy, virtually everyone will be able to sleep comfortably down to freezing, and many people can push it another 10-15 degrees or more before hitting their "limit" of comfort.

Also, please note that ALL EN tested bags require a mattress of R-value 5 to meet their claimed EN rating.

So we are super excited that the Zenbivy Bed meets our goal of being a single solution that will keep you warm and comfortable in all above-freezing applications, and with additional clothing, it can easily be a 4 season solution for a lot of people.

Enclosed is a copy of the final test results, along with some pics of the test in action.  As always, please let me know if you have any questions.

(Note: the test bag also came in 2 ounces under our claimed weight, based on our latest pattern tweaks; stay tuned for final specs, but it is certain we will meet our beat our advertised product weights at this point.)

Zenbivy Bed EN Test Results
Zenbivy Bed EN Test Results

 

Zenbivy Bed EN Test images
Zenbivy Bed EN Test images

 

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