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Rab Stratosphere 4 Sleeping Pad Review

Jade Downing (gear tester)
Jenny Abegg author bio
ByMultiple Authors
May 21, 2025
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Our Take:
4.1/5
Certified
The Rab Stratosphere 4 ($140) is a solid workhorse sleeping pad that earns its keep with impressive durability and value. Its full 75-denier polyester construction is the toughest of any pad we tested, offering serious peace of mind for rocky campsites and rough conditions. That said, comfort and warmth are merely average, with a below-par 3.1-inch thickness and a modest R-value of 3.8. If long-term durability and affordability top your list, the Stratosphere is well worth considering—but ultralight backpackers or cold-weather adventurers should look elsewhere.
Comfort

Comfort

2.5/5
Warmth / Weight

Warmth / Weight

2.5/5
Packed Size

Packed Size

4/5
Durability

Durability

4/5
Ease of Use

Ease of Use

3/5
Sustainability

Sustainability

4.9/5

Type

Air

R-value

3.8

Weight

1 lb. 8.5 oz.

Packed Size

9.4 x 4.7 in.

Thickness

3.1 in.

Fabric(s)

75D polyester

Pros

75-denier polyester construction is one of the thickest pad fabrics we’ve tested.
Side-loading stuff sack makes for easy storage.
Affordable.

Cons

Not very warm for its weight.
Wide vertical baffles aren’t as comfortable as air cells or box baffles.
Cheap-feeling plastic valve.

For this season's top models, see our guide to the Best Backpacking Sleeping Pads.

The Rab Stratosphere 4 lands squarely in the middle of the pack when it comes to comfort—supportive enough for a decent night’s sleep, but not especially plush compared to top-tier pads. At 3.1 inches thick, it falls short of standout models like the Nemo Tensor All-Season and Big Agnes Rapide SL (both 3.5 in.), and I found its wide vertical baffles less comfortable than the smaller box-style baffles found on more premium sleeping pads.


That said, I was genuinely surprised by how well the Rab Stratosphere 4 supported me while side sleeping—my hips never touched the ground, even on rocky terrain. As someone prone to pressure points, that felt like a win. The pad is also impressively quiet—none of the crinkly noise that often plagues lightweight air pads. Still, given the weight and price, there are cushier, more supportive options.

The Rab Stratosphere 4 doesn’t impress when it comes to warmth for the weight. With a 3.8 R-value, it’s adequate for summer backpacking but falls short for colder shoulder-season trips—and it’s definitely not built for winter use. The bigger issue is its weight: at 1 pound 8.5 ounces, you’d expect more insulation in return.


There are simply more efficient backpacking sleeping pads out there. The Nemo Tensor All-Season weighs just 1 pound and packs a 5.4 R-value. The Therm-a-Rest NeoAir XLite delivers a 4.5 R-value at just 13 ounces, and the Big Agnes Rapide SL manages a 4.8 R-value at 1 pound 2 ounces. Even the budget-friendly Big Agnes Divide Insulated offers a similar 4.0 R-value for less weight. Bottom line: the Stratosphere’s warmth-to-weight tradeoff doesn’t stack up well against the competition.

The Rab Stratosphere 4 falls right in the middle of the pack when it comes to packability. With a packed size of 9.4 by 4.7 inches, it’s certainly compact enough for backpacking, though it will be a tighter squeeze in an ultralight setup. For comparison, the Stratosphere is a bit bulkier than category leaders like the Big Agnes Rapide SL (7 x 4 in.) and Therm-a-Rest NeoAir XLite NXT (9 x 4.1 in.), and roughly on par with other midrange pads like the Exped Ultra 5R (9.1 x 4.9 in.). Overall, its size makes it a decent crossover choice—compact enough for the trail, but not too minimal for car camping either.

The Rab Stratosphere 4 is one of the most rugged backpacking sleeping pads on the market, thanks to its burly 75-denier polyester construction on both the top and bottom. That’s thicker than even some car camping pads, and significantly more robust than the typical 20D to 40D range found in most lightweight backpacking models. For reference, even top-tier pads like the Therm-a-Rest NeoAir XTherm only use 30D on top, and very few models match the Stratosphere’s full 75D build.


That toughness translated to confidence in the field—I had no hesitation sitting, shifting, or even cooking next to the Stratosphere during a wet, rocky basecamp stay. It doesn’t deliver class-leading warmth or plush comfort, but for rough terrain or rowdy conditions, it’s an excellent choice. If you’re looking for one pad that can handle both car camping and backpacking without babying it, the Rab Stratosphere 4 is a compelling, peace-of-mind pick.

The Rab Stratosphere 4 is fairly straightforward to use, but a few design quirks hold it back from feeling truly refined. It comes with a pump sack—always a welcome addition—but like many others on the market, I found it awkward and inefficient. It took some effort to get a good seal, and more often than not, I resorted to finishing inflation by blowing directly into the valve. The two-way valve itself works fine but has a cheap, plasticky feel that doesn’t inspire a ton of confidence, especially compared to the smoother, more robust systems on higher-end backpacking sleeping pads.


One bright spot is the pad’s side-loading roll-top stuff sack. It’s generously sized and makes packing up noticeably easier than the usual top-loading compression bags, which often feel like an unnecessary battle at the end of a long hike. Overall, while the Stratosphere 4 won’t cause major headaches in the field, it doesn’t offer the polished, user-friendly experience we’ve seen from some of its closest competitors.

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Longevity

Choosing durable outdoor gear and keeping it in use for longer is one of the best ways to reduce environmental impact. Our proprietary longevity rating assesses factors like overall build quality, materials, fabric denier, component durability, and real-world performance. A green check indicates that we expect the product to be long-lasting relative to its peers, a yellow check mark indicates average longevity, and a red X indicates a product that may have a limited lifespan.

The Rab Stratosphere 4 comes in three sizes—regular (72 x 20 in.), regular wide (72 x 25 in.), and long wide (77 x 25 in.)—offering solid options for different body types and sleeping styles. I’m 5’9” (174 cm) and typically use a regular-sized pad, but for this review, I opted for the regular wide, and I’m glad I did. The extra width gave me a surprising amount of room to sprawl—I had about a third of the pad to spare in width, which made side sleeping and moving around at night feel much more comfortable and unrestricted.


My husband and I—both medium build—even tried sharing the pad briefly. It worked fine if we were cuddling or spooning with my head on his shoulder, but lying at opposite ends wasn’t really doable. For solo use, though, the regular wide felt spacious and ideal, particularly for back or side sleepers who want a little more wiggle room without stepping up to a double pad.

Big Agnes Rapide SL Insulated ($170): Well-Rounded Value Pick
When stacked up against the Rab Stratosphere 4, the Big Agnes Rapide SL Insulated takes the lead across nearly every metric—comfort, weight, warmth, and packability. For $30 more, the Rapide SL is lighter (1 lb. 2 oz.), thicker (3.5 in. with 4.25-in. raised side rails), and warmer (R-value 4.8), while also packing down smaller than any other pad in our test (7 x 4 in.). It’s simply more pad for less money. That said, the one area where it lags behind the Stratosphere 4 is durability. Big Agnes does not provide a denier spec, but its safe to say its fabric is significantly thinner than that of the Statosphere. But unless you consistently sleep on rough terrain and want maximum abrasion resistance, the Rapide SL is the smarter, more comfortable, and more versatile choice. For more, read our review of the Big Agnes Rapide SL Insulated.


Therm-a-Rest NeoAir XTherm ($230): Durability at a Low Weight
If you’re after maximum warmth and minimal weight without sacrificing durability, the Therm-a-Rest NeoAir XTherm is one of the best in the game. It matches the Rab Stratosphere’s 70D bottom for ruggedness but saves weight with a 30D top, resulting in a total weight of just 15.5 ounces (over a half-pound lighter than the Stratosphere). It’s also vastly warmer, with a winter-ready R-value of 7.3 compared to the Stratosphere’s mild-weather 3.8. You’ll pay almost $100 more for the performance, but for high-altitude missions or cold-weather backpacking where weight, warmth, and reliability matter most, it’s a better-executed package. For more, read our Therm-a-Rest NeoAir XTherm review.

Rab Stratosphere 4 ($140)
Carrying the Rab Stratosphere 4 sleeping pad
4.1/5

This pad is Rab’s entry into the value air pad category, and its durability deserves praise. Otherwise, the Stratosphere 4 is middle-of-the-road in other key performance categories, and we think there are better budget pad options on the market.

Type
Air
R-value
3.8
Weight
1 lb. 8.5 oz.
Packed Size
9.4 x 4.7 in.
Thickness
3.1 in.
Fabric(s)
75D polyester
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Comfort

2.5/5
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Warmth / Weight

2.5/5
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Packed Size

4/5
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Durability

4/5
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Ease of Use

3/5
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Sustainability

4.9/5
Big Agnes Rapide SL ($170)
Big Agnes Rapide SL sleeping pad baffle design
4.5/5

The Rapide SL Insulated proves that standout comfort doesn’t always need a big price tag to match. This pad’s cushion, warmth, and weight should make it appealing for a wide variety of backpackers, although we’d prefer a larger stuff sack.

Type
Air
R-value
4.8
Weight
1 lb. 2 oz.
Packed Size
7 x 4 in.
Thickness
3.5 in.
Fabric(s)
Nylon
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Comfort

4/5
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Warmth / Weight

4/5
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Packed Size

4.5/5
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Durability

3/5
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Ease of Use

3.5/5
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Sustainability

2.3/5
Therm-a-Rest NeoAir XTherm NXT ($230)
Getting sunshine while laying on the Therm-a-rest NeoAir XTherm sleeping pad
4.6/5

Thanks to its fantastic insulation, the NeoAir XTherm is a longstanding favorite of winter alpinists and high-altitude climbers. It’s also more durable than comparable pads. However, it’s one of the most expensive models on the market and overkill for warm-weather outings.    

Type
Air
R-value
7.3
Weight
15.5 oz.
Packed Size
11 x 5 in.
Thickness
3 in.
Fabric(s)
30D/70D nylon
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Comfort

3/5
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Warmth / Weight

5/5
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Packed Size

4/5
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Durability

4/5
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Ease of Use

3.5/5
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Sustainability

2.3/5

Is the Stratosphere 4 for You?

The Rab Stratosphere 4 is a great pick for backpackers and campers who value durability above all else. With 75-denier fabric on both the top and bottom, it’s one of the most rugged sleeping pads we’ve tested—ideal for rocky campsites, cowboy camping, or anyone who doesn’t want to baby their gear. But the toughness comes at a cost: the Stratosphere’s 3.8 R-value relegates it to summer and mild shoulder-season trips; at over 1.5 pounds, it’s heavier than average. If you’re looking for an all-season ultralight, this isn’t it, but if durability and simplicity are your top priorities, the Stratosphere 4 delivers solid comfort and peace of mind in rough terrain.

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