The Inertia XL is a light and comfortable sleeping pad that packs down small. This is not the first sleeping pad that I have reviewed from Klymit, but it is the most comfortable. I will be upfront that I loved the Inertia X-Frame or this pad’s “little brother” for its size and weight. That said the Inertia XL is a great option for those who want just a little more comfort and can sacrifice a little weight.