Stratosphere 4 Sleeping Mat – Regular Wide

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The Rab Stratosphere 4 is a cosy, packable sleeping pad for three-season backpacking. Its recycled insulation provides excellent comfort, insulation, and durability.

Rab says: 

Lightweight and compact, the Stratosphere 4 boasts a superior warmth-to-weight ratio, making it a versatile all-mountain sleep mat which has a small enough pack size to take on all your trekking, climbing and backpacking adventures. The recycled Stratus™ R insulation is designed to trap air and reduce heat loss through convection, helping to maintain your temperature when the mercury drops and ensuring you recharge ready for tomorrow’s challenges.

The mat features a low-profile two-way valve and comes with a handy pump sack, so it’s quick and easy to inflate when you’re ready to hunker down for the night. Oversized outer chambers keep you in the centre of the mat and stop you rolling off in your sleep, while the spacious rectangular shape will ensure a comfortable night’s rest whatever your preferred sleeping position.

Constructed using 100% recycled insulation and recycled outer fabric finished with a fluorocarbon-free DWR, the Stratosphere 4 is a robust and reliable sleep mat which you can depend on to keep you comfortable, warm, and well-rested.

Our Verdict

The Rab Stratosphere 4 is a warm, cosy, and packable sleeping pad ideal for three-season backpacking and camping. It uses recycled Stratus R insulation and provides an impressive R-value of 3.8 while keeping weight down to 890g.

The 8 cm thickness offers excellent comfort and insulation from the ground. The rectangular shape with oversized outer baffles allows plenty of room to shift sleeping positions throughout the night.

Key features include the low-profile two-way valve for easy inflation/deflation, included pump sack, and durable 75D recycled polyester shell with fluorocarbon-free DWR coating.

While the Stratosphere may not be the lightest mat on the market, it compensates with its durable construction and competitive price. Striking the balance between weight and durability is a common challenge in gear selection. It’s refreshing to have a well-built option that prioritises robustness as an option. 

The Stratosphere 4 packs down reasonably small at 30x14cm. It hits a nice balance of warmth, cushioning and pack size/weight for backpackers looking for a premium sleeping pad.

– Reviewed by Ultralight Outdoor Gear

Features

• 75D Recycled Polyester outer fabric with internal TPU Coating and fluorocarbon free DWR
• Stratus™ R 100% recycled polyester 160gsm insulation
• Stratus™ R insulation traps air and reduces heat loss from convective currents
• Lightweight construction and insulation for superb warmth-to-weight ratio and minimal pack size.
• Oversized outer chambers helps keep you centralised on the mat
• Hybrid rectangular shape allows various comfortable sleeping positions
• Low profile two-way valve for easy inflation and deflation
• Pump sack included for rapid and hygienic inflation
• Roll-away stuff sack with repair kit included

Specifications

• Weight: 890g (excluding bag)
• Dimensions: 183 x 64 cm
• Thickness: 8cm
• Packed size: 30 x 14 cm
• R-Value: 3.8

Material & Construction

• 75D Recycled Polyester outer fabric with internal TPU Coating and fluorocarbon free DWR
• Insulation: Stratus™ R 100% recycled polyester 160gsm insulation

ASTM R-Value:

From 2020, there is a new industry standard for measuring the R-value (level of insulation) of sleeping mats – ASTM F3340-18. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags.

You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. In simple terms, the higher the R-value, the warmer the mat.

In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. This will be also be dependent on your sleeping bag, how cold you sleep etc. Please contact our customer service team if you need advice on choosing the right mat for your activity.

Help & advice:

• The Ultimate Guide to Choosing an Ultralight Sleeping Mat
• Time-Saver Guide to Choosing a Sleeping Mat
• About Rab
• Rab Sleeping Mat Guide
• Rab Sleeping Mat Technology Explained
• Rab Sustainability and Responsibility
• R-Value Explained
• Recycled Content in Outdoor Gear