| Job | Cushion + insulate from the ground |
| Warmth | Measured by R-value |
| Types | Air, self-inflating, closed-cell foam |
| Difficulty | Beginner |
A sleeping pad is an insulating, cushioning mat placed under a sleeping bag to provide comfort and, crucially, insulation from the cold ground. Its warmth is measured by R-value. Types include air pads, self-inflating pads, and closed-cell foam, trading off warmth, weight, comfort, and durability.
Why it’s essential
A sleeping bag can’t insulate where your body crushes it, so the pad’s R-value stops the ground stealing your heat.
Types
Air, self-inflating, and closed-cell foam pads.
Frequently asked questions
Why do you need a sleeping pad?
Two reasons: comfort, and — more importantly — insulation. Lying in a sleeping bag compresses its underside flat, so it can't insulate you from the cold ground, which steals body heat. The pad provides that ground insulation (its R-value) plus cushioning for a better night's sleep.
What R-value sleeping pad do I need?
Roughly R1-2 for warm summer nights, R3-4 for three-season use, and R5+ for winter and snow. When sleeping on snow, a high R-value (or stacking pads) is essential. Match the pad's R-value to the coldest ground you'll sleep on.
What are the types of sleeping pad?
Air pads (light, packable, comfortable, but can puncture), self-inflating pads (foam-and-air, comfy and durable but heavier), and closed-cell foam pads (cheap, indestructible, and warm-ish but bulky and firm). Each trades warmth, weight, comfort, and durability differently.
Sources
- Sleep systems — The Mountaineers