Hypersphere 9.5 Sleeping Mat – Long Wide

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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 Long Wide Sleeping Mat is a robust and exceptionally warm option for those venturing into extremely cold, expedition-type environments. Weighing 1151 grams, it offers an industry-leading R-value of 9.5—the highest currently available—delivering unmatched insulation against freezing ground temperatures.

With its extra length and width, this version provides even more room to stretch out, making it ideal for taller users or those who prefer more space. The 10 cm thickness ensures excellent comfort, while oversized outer chambers cradle you in place, preventing unwanted midnight slides. The durable 75D recycled polyester fabric is built to withstand tough terrain, and Rab’s pump sack makes inflation quick and effortless, sparing your lungs after a long day on the trail.

While the Long Wide version adds some extra weight, no other mat on the market currently offers this level of insulation. If you’re heading into extreme conditions and need maximum warmth, comfort, and space, the Hypersphere 9.5 Long Wide is a top contender.

– Reviewed by Ultralight Outdoor Gear

Features

• Outstanding R-value, at 9.5 for a weight of just 1151g.
• 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: 1151g (ex bag)
• 196cm x 64cm x 8cm
• Packed size Regular wide: 27cm x 16cm (10.6in 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