Hypersphere 9.5 Sleeping Mat – Regular

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When warmth and comfort are critical, this thick, rugged, down-filled sleep mat ensures a sound night’s sleep in the world’s coldest environments.

Rab says: 

The Hypersphere 9.5 is the result of our 40 years of down mastery combining with the technologies we’ve honed for our lightweight sleep mat collection. This thick, ultra-warm down-filled sleep mat offers unmatched comfort and insulation for when you’re hunkering down at high altitudes or on expeditions to polar regions. With a hardwearing fabric and uncompromisingly comfortable design, it’s rugged, versatile, and adapts easily to remote and challenging environments.

Our Verdict

The Rab Hypersphere 9.5 Sleeping Mat is a robust and exceptionally warm option for those venturing into extremely cold, expedition environments. Weighing approximately 895 grams, it offers an industry-leading R-value of 9.5—the highest currently available—ensuring unparalleled insulation against freezing ground temperatures.

The mat’s 10 cm thickness provides excellent comfort, while oversized outer chambers cradle you in place, preventing unwanted midnight slides. The durable 75D recycled polyester fabric holds up well in rugged terrain, making it a reliable choice for demanding expeditions. Inflation is quick and hassle-free thanks to Rab’s pump sack, saving your lungs from a post-hike workout.

While the Hypersphere 9.5 is slightly heavier than some alternatives, no other mat matches its insulation performance. This is the mat to beat if warmth, comfort, and durability are your top priorities in extreme conditions.

– Reviewed by Ultralight Outdoor Gear

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.

Features

• Outstanding R-value, at 9.5 for a weight of just 895g.
• Oversized outer chambers help keep you centralised on the mat.
• Heat is trapped and stabilised in the 650FP duck down, providing an effective thermal barrier between you and the freezing ground.
• Lightweight construction uses air and insulation for superb warmth-to-weight ratio and minimal pack size.
• At 10cm thick, the mat is exceptionally comfortable and supportive.
• Hybrid rectangular shape allows various comfortable sleeping positions.
• Withstands the rigours of an expedition with durable 75D recycled fabric.
• Pump sack included for rapid and hygienic inflation.
• Roll-away stuff sack with repair kit included.
• The two-way valve allows you to inflate and deflate the mat with ease, so you can take refuge quickly when the cold is closing in.

Specifications

• Weight: (ex bag)
• 183cm x 51cm x 8cm
• Packed size Regular: 24cm x 16cm (9.4in x 6.3in)

Material & Construction

• Embossed 75D recycled polyester with internal TPU coating (LW Glue)
• 75D recycled polyester with intrernal TPU coating (LW Glue)
• 650FP European Duck Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (260g /9.17oz)
• 100% Recycled Polyester

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