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Klymit Inertia XL

rated 4.0 of 5 stars
photo: Klymit Inertia XL air-filled sleeping pad


Price Current Retail: $59.95
Historic Range: $39.00-$129.95
Reviewers Paid: $40.00-$80.00
Weight 14.1 oz / 400 g
Dimensions 78 x 25 x 1.5 in / 198.1 x 63.5 x 3.8 cm
Inflation 5-7 Breaths
Pack Size 4 x 8 in / 10.2 x 20.3 cm
Fabric 75D Polyester


4 reviews
5-star:   1
4-star:   2
3-star:   0
2-star:   1
1-star:   0

Very light, very compact, minimalistic sleeping pad for someone willing to try something different.


  • Lightweight
  • Small pack size
  • Comfortable


  • Too thin overall
  • Bulky hand pump
  • Difficult to deflate

So the idea behind the Klymit Inertia XL is to provide support under all the key pressure points that your body uses when lying on the ground. For any point that is not a key support point, Klymit has left a cutout in the baffles. This is to allow any loft if your sleeping back to fill the void and give you additional warmth rather than flattening your bags loft as traditionally happens.

I can't tell you that this additional warmth is true in practice, however I can attest that design of this pad and reduction of material used has made it extremely lightweight and compact when packed. The pad is also designed to be placed either inside or outside of your sleeping bag. I'm not sure I subscribe to the practice of putting the pad inside the bag. I use a very lightweight and thin skinned down bag and I want to protect it from the ground usually. The pad is that protection.

The XL weighs a mere 16oz. without the included bulb style hand pump and 1lb 1oz. with it. I know why they included the hand pump. The pad is can be difficult to inflate to the full volume with just human breath. Klymit intended for the pump to be used to fine tune the pad to the users liking and add that added final rigidness to the pad that you may require. Unfortunately, the bulb style pump is cumbersome when compared to the sleek design of the pad. I typically opt to leave it at home.

The construction of the pad seems very sturdy. Nice even seams all around. That is saying a lot considering the very odd layout of baffles on this pad.

Because of those baffles, deflating the pad is a challenge as well. The air is trapped in very narrow paths that lead in a variety of directions throughout the pads surface. This makes chasing the air out much more difficult than that of a traditional pad. It usually requires that I fold and roll 2 to 3 times, usually in varying directions to get all the air out before making the final packing roll up into the stuff sack.

Also of note, the valve that Klymit used seems a little too easy to depress. It's a simple push button, with a ridge of plastic to keep it from getting pressed unintentionally, but it's almost like that's no tension behind it at all. I'm still afraid it will deflate if it touches a piece of gear in the tent on accident.

On a positive note, I find this pad very comfortable. I'm one that likes to lean my head against something when lying down, or at least have it cradled in place. This pad has an excellent bowl shape built into the baffles around the head that cup the skull and keep it perfectly in place. I've never had a pad like it and it all but eliminates the need for a pillow. Very nice!

Despite some of the complaints, I still highly recommend this pad. It's kind of quirky, but in a functional kind of way. You get the benefit of an ultralight sleeping pad but with out all the crinkly, loud noise of some of the other brands.

Source: bought it new
Price Paid: $68 via groupon


Thanks for the review. I almost bought one of these several times last year but just wouldn't do it. I'm a side sleeper and I was concerned how it might feel on the hips. Does it work OK that way or is it better for back sleepers?

8 years ago
thetentman RETAILER

I love my Klymit pad. Very light, comfortable and compact. At first deflating and packing was an issue but I can now get on the first try most times. I use mine in the bag and use a 2.5 x 7 coated nylon sheet underneath.

8 years ago

Good question regarding side sleeping... I've been able to do it, but it requires quite a bit more pressure as with any pad. All your weight goes into a smaller area on the pad. The bad part is that with this pad you pretty much have to use the hand pump to be able to get the pressure that high. It's just too thin otherwise to be able to pull it off. This pad is definitely designed for back sleepers, those are the users that will get the most out of this it. If you still need lightweight I'd probably go with the NeoAir or equivalent, better R rating too.

8 years ago

This product is best for people less than 180# and very very patient.


  • The first pad meant for tall people
  • The weight is perfect


  • Too flat for your pressure points. My hips hurt!
  • Hard to TOTALLY deflate and get back in stuff sack.

I am 6'1" and 240 pounds. I was so excited for this pad. It was quick and easy to inflate after a long day hiking so I was hopeful. But then I tried to lie on it... within minutes my buttocks felt the ground; turned to the side, my hip felt the pressure, my arm went numb from the pressure.

On and on, side to back to side all night long! I couldn't wait until the morning!

I do not recommend this pad and to tell you the truth, the extra length was unnecessary! It barely fit in my tent.

Source: bought it new
Price Paid: $80


Welcome to Trailspace, Stephanie. Have you tried other pads that were more comfortable for you?

5 years ago

Great lightweight, compact sleeping pad.


  • Packs small
  • Fairly light


  • None really

I have been using an older army inflatable pad that is very durable and reasonably comfortable, but is heavy and does not pack down well. I bought a pair of these Inertia XL for me and my son.

I am very impressed with how small and light the pads are and how well they lay. Pumped up with the included bulb the pads don't bottom out and are pretty comfortable. Can be had for a reasonable price and have a good warranty.

Source: bought it new
Price Paid: $40

Very light, very compact, minimalistic sleeping pad for someone willing to try something different.


  • Lightweight
  • Small pack size
  • Comfortable


  • High purchase price

Here you can watch the review. Have fun.

Source: bought it new
Price Paid: 100€

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