What R-Value Actually Measures
R-value measures thermal resistance –how well a material resists heat flow. For sleeping pads, a higher R-value means more insulation between you and the ground. Ground is the primary source of heat loss during sleep: without a pad, your body heats the earth directly, and cold ground conducts heat away from you 3–x faster than cold air.
Summer only
3-Season
Cold weather
Winter
The R-Value Scale: What Each Level Means
| R-value range | Usable to | Typical conditions | Example pads |
|---|---|---|---|
| R 1.0–.0 | 50°F+ (10°C+) | Warm-weather camping, summer | Thin foam mats, ultra-light touring pads |
| R 2.0–.5 | 35–0°F (2–0°C) | Summer into shoulder season | Lightweight sleeping pads, 3-season moderate |
| R 3.5–.0 | 20–5°F (-7–°C) | Spring/fall standard | Most 3-season backpacking pads |
| R 5.0–.5 | 0–0°F (-18 to -7°C) | Early winter, high altitude | Expedition-weight pads, cold-weather backpacking |
| R 6.5–.0 | -20–°F (-29 to -18°C) | Deep winter, mountaineering | Winter expedition pads |
| R 8.0+ | Below -20°F (-29°C) | Extreme altitude / polar conditions | Specialized expedition pads |
Key insight: R-values are additive. If you use an R 3.0 foam pad under an R 3.0 inflatable, your combined R-value is approximately 6.0. This combination approach is common in winter camping where a closed-cell foam pad provides a durable base layer and an inflatable adds warmth on top.
OGERY vs NEMO vs TETON: R-Value Compared
| Pad | R-value | Weight | Packed size | Thickness | Best for |
|---|---|---|---|---|---|
| OGERY R-9.0 | 9.0 | 1.45 lb | 6" × 11" | 4.0" | Extreme cold, 4-season use |
| TETON Outfitter XL | 6.5 | ~2.5 lb | 7" × 14" | 3.5" | Winter camping, cold conditions |
| NEMO Tensor Alpine | 4.5 | ~1.0 lb | 4" × 9" | 3.5" | 3-season, weight-conscious |
The OGERY R-9.0 vs NEMO Tensor: The OGERY's R-value of 9.0 is nearly double the NEMO Tensor Alpine's R-value of 4.5. This means the OGERY provides roughly 2x the insulation from the ground. In practice, this translates to approximately 10–5°F of additional warmth –the OGERY can keep you comfortable in conditions where the NEMO would leave you cold.
How R-Value Combines with Your Sleeping Bag
Your sleeping bag provides warmth from above. Your sleeping pad provides insulation from below. Together, they create your complete sleep system. Understanding how they interact helps you avoid buying the wrong combination.
| Temperature | Minimum pad R-value | Recommended pad R-value | Why bag rating alone is not enough |
|---|---|---|---|
| 40°F+ | R 2.0 | R 2.5–.5 | Any sleeping bag handles this –pad matters more than bag |
| 30°F | R 3.5 | R 4.0–.0 | A 20°F bag with R 2.0 pad may feel like a 30°F system |
| 20°F | R 5.0 | R 5.5–.5 | Without adequate pad R, you lose 10°F+ of bag warmth |
| 10°F | R 6.0 | R 7.0–.0 | Winter conditions require high R from the pad |
| 0°F and below | R 7.5 | R 8.5–.5 | Consider layering: foam base + inflatable for R 8+ |
Seasonal R-Value Recommendations
Summer (50°F+): R 2.0–.0
In warm weather, you primarily need a pad for comfort and moisture barrier, not insulation. A thin foam pad (R 1.5–.0) or lightweight inflatable (R 2.5–.0) is sufficient. Prioritize weight and packability over warmth.
Shoulder Season (30–0°F): R 3.5–.0
Spring and fall nights are where pad R-value becomes critical. Temperature swings of 20°F between day and night are common. A pad in the R 4.0–.0 range handles most 3-season conditions reliably. If you run cold, go higher –R 5.0 minimum.
Winter / Cold Weather (Below 30°F): R 6.0+
Below freezing, the ground is a heat sink. Without adequate R-value, you lose body heat continuously through the night regardless of how warm your bag is. The NEMO Tensor Alpine at R 4.5 is not adequate for sustained winter camping. The TETON Outfitter XL at R 6.5 is better. The OGERY R-9.0 handles extreme cold.
R-Value Calculator
What R-Value Do You Need?
Enter your expected conditions and sleeping bag rating to find your minimum recommended R-value.
Key Takeaways
- R-value measures ground insulation, not bag warmth. Both components are required for a complete sleep system. A 0°F bag with an R 2.0 pad is not a 0°F sleep system.
- R-values are now standardized (ASTM F3340-18). You can compare R-values across brands directly. An R 5.0 from OGERY is equivalent to R 5.0 from NEMO.
- The OGERY R-9.0 leads in warmth. At R 9.0, it is designed for extreme cold and 4-season use. The TETON Outfitter XL (R 6.5) handles most winter conditions. The NEMO Tensor Alpine (R 4.5) is ideal for 3-season use.
- R-values are additive. Layering a closed-cell foam pad (R 2.0) under an inflatable (R 3.5) gives you R 5.5 combined –a common winter strategy.
- Seasonal guide: R 2– (summer), R 3.5– (3-season), R 6+ (winter). Match your pad R-value to the coldest conditions you expect to encounter.
Compare sleeping pads side by side
See R-values, weights, packed sizes, and warmth ratings for OGERY, TETON, and NEMO pads.
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