Add a regular-size ALPS Mountaineering Foam Mat 625 Sleeping Pad under your sleeping bag to improve the level of comfort when you're backpacking.
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ALPS Mountaineering Foam Mat 625 Sleeping Pad - Regular
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The Large 750 Mat is a good choice for general camping. The extra thick .75-inch foam will make you think you are sleeping at home. The .25 x 77 inch size works with most rectangular an ALPS Mountaineering foam mat to the bottom of your sleeping bag to improve the level of comfort. The foam mats are all extremely lightweight so you won't be hauling along too much extra weight on your next hike, but will be adding enough padding to make a noticeable difference in how well you sleep at night.
Alps Mountaineering - Foam Mat 625 Gray XL