Klymit Inertia X Frame Review – A New Class of Ultralight Sleeping Pads

Klymit Inertia X frame Review
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The Klymit Inertia X Frame Sleeping Pad offers a unique take on ultralight sleeping pads. In order to save weight, the engineers at Klymit HQ have been studying the human body to discover which parts of the pad are necessary. The inertia X Frame’s minimalist design has removed most of the padding, leaving only the essential areas to support your body. In this Klymit inertia X Frame Review, I plan to address what I liked most about this pad, and where it could be improved.

Disclosure: This post contains affiliate links, meaning that if you click on a link and make a purchase, I will receive a small commission at no extra cost to you. I am not sponsored to promote a product, and all product reviews are of my own opinion.

Quick FactsKlymit Inertia X Frame Sleeping Pad

Weight: 9.1 Oz
Dimensions (inflated): 72 x 18 x 1.5 inches / 183 X 46 X 3.8 cm
Dimensions (packed): 6 X 3 inches /15.2 X 7.6 cm
Price:$69.95 USD
Where to Buy: Moosejaw.comAmazon.com

Klymit Inertia X Frame Review

Klymit Inertia X Frame
  • Weight
  • Comfort
  • Durability
  • Price


The Klymit inertia X Frame is designed to support the sleeper in key areas. The Head, shoulders, waist and feet. The pad saves on weight by removing unnecessary materials. At first glance the pad appears very flimsy, but it is sturdier than it looks.

It is easy to set up, taking only 5-7 breaths. There is also an additional hand pump to make the pad extra firm. This allows you to adjust the pad to your liking.

The Inertia X Frame comes with its own stuff sac, and also comes with a repair kit. I would store the the repair kit separately, as I just discovered the glue can explode and leak everywhere.

Repair kit malfunction

Klymit Inertia X Frame Trail Performance

I haven’t used this pad on the trail, but I have used its more durable cousin the Inertia X Frame Recon. The designs are identical, the only exception is that the recon version is made with a more durable material. But in essence the recon will perform exactly as the standard version.


My Thoughts

My first thoughts were positive. It is extremely lightweight, easy to set up. I did find it a little small however.
The pad is designed for someone who is 6 ft tall. As I am a little taller than that, I found that my feet would hang off the end of the pad. However, I did not find this too concerning. My big concern was that my shoulders are wider than the pad. So while my shoulder were just on the pad, my arms were on the ground.

Comfort Level

Hand pump that can adjust the pads firmness, to get it as comfortable as possible

I found the pad comfortable enough, but it was not perfect. The main reason for discomfort has to do with the size. I felt very restricted on the pad which is something I did not enjoy. I do feel like this is something that will take some getting used to, and will be worth it once you do.

But with that being said, I did find it more comfortable in some areas compared to your traditional sleeping pad.
Since the Inertia X Frame has a lot of material missing, a lot of pressure points that might cause discomfort have been removed, which makes it more comfortable than other pads.

One complaint common with sleeping pads, is that you can feel every little rock or tree root underneath. I did not find this to be the case with the Klymit Inertia X Frame. Since there is less material, than rocks and tree roots that might cause discomfort, cannot do that anymore since there is no material for it to push up on.

Is the Pad Good for Side Sleepers?

A lot of people ask if you can sleep on your side using this pad. As a fellow side sleeper I can confirm that it is possible to sleep on your side. I even think that it might be more comfortable than on your back (OK, I might be biased, so here me out).

When I was trying to sleep on my back, I felt constricted because of the narrowness of the pad. This was not a problem sleeping on my side! If you do sleep on your side, I recommend using a pillow, as the head support doesn’t really work when sleeping sideways.

Unique Way to Keep You Warm

The Klymit Inertia X Frame does not have any insulating properties, but has a unique way to keep the user warm.

Inertia X frame has “loft pockets” to keep you warm

All the holes in the Inertia X frame are known as “loft pockets”. Usually with a sleeping bag, the bottom side gets compressed under your own weight and it loses its insulation value.

With the Inertia X Frame, a sleeping bag is able to retain its loft through the loft pockets. So in essence, it is your sleeping bag that is keeping you warm.

It would be easy to think that the warmer the sleeping bag, the more insulating the loft pockets will become.

Unfortunately, this is not true. The sleeping pad has a thickness of about 4 cm. This means the loft of the sleeping bag is going to be reduced, and hence its insulating properties. So this pad is best used a 3 season pad.

The other drawback to the loft pocket technology, is that you are limited to using it with a sleeping bag. A quilt is completely useless with this pad.



  • easy to set up. You can set it up in just 5 breaths
  • lightweight. This is the lightest full length sleeping pad available
  • Reasonable Price. At $69.95 it is very well priced when compared to other ultralight sleeping pads.
  • Lifetime warranty. Klymit provides a lifetime warranty with this pad, and will replace it if it gets damaged.


  • Size. It is very minimal and taller or wider users may find this uncomfortable
  • Narrow, If you have wide shoulders you may be uncomfortable
  • Limited to using a sleeping bag

Recommended for

The Klymit Inertia X Frame would be a great fit for anyone who is looking to lighten up their packs and is using a sleeping bag instead of a quilt. Ideally you will be less than 6 ft tall, but it will work if you are over 6 ft and don’t you feet hanging off the end.

The Verdict

I personally enjoyed the Inertia X frame and would recommend to anyone who is looking to lighten their load. This pad is the lightest, full length sleeping pad available and would be perfect for any ultralight backpacker to add to their collection.

If you are counting ounces, then remember that if you decide to use this pad, you are going to have to use a sleeping bag. So there will be a little extra weight in that department compared to using a quilt.

It was a little uncomfortable for me, but I think that just comes down to having to get used to it. And I do think it was more comfortable than other sleeping pads.

I hope you found this Klymit Inertia X frame Review helpful. If you have any questions feel free to ask me in the comments. If you have used this product before I would also love to hear your thoughts.