Rab Hypersphere Ultra 7.5 Sleeping Mat – Regular Wide

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Ultra-warm and ultralight, this is the ultimate down sleep mat for moving fast in cold places, from winter alpine climbing to arctic ultra running.

Rab says: 

Leaning on our decades of expertise in high-performing down jackets and sleeping bags, we’ve crafted our definitive down-filled mat for lightweight missions in cold environments. Powered by 800FP down and ultralight 20D fabric, it offers exceptional warmth for its weight. Whether you’re taking on an arctic ultra race or travelling to high altitudes by rope and sharps, this incredibly warm yet light and packable down air mat is ideal for fast-moving pursuits in extreme conditions

Our Verdict

Rab’s Hypersphere 7.5 Sleeping Mat is a standout choice for fast-moving adventures in harsh, cold environments. Weighing just 765 grams with an impressive R-value of 7.3, it delivers exceptional insulation for winter alpine climbs and arctic expeditions without adding unnecessary bulk.

With a generous 8cm thickness, it offers excellent cushioning, while oversized outer chambers help keep you centred through the night—minimising the risk of rolling off uneven ground. The 800-fill power goose down traps heat efficiently, reducing convection currents and maximising warmth. Inflation is quick and effortless thanks to Rab’s included pump sack, making setup a breeze after a long day on the move.

For those prioritising warmth, weight, and packability, the Hypersphere 7.5 is a reliable companion for demanding 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

• Impressive warmth for weight, with an R-value of 7.3 and a weight of just 607g.
• Oversized outer chambers help keep you centralised on the mat.
• Filled with 800FP goose down, which works to trap heat by minimising convection currents within the mat.
• Lightweight construction uses air and insulation for superb warmth-to-weight ratio and minimal pack size.
• Exceptionally light and packable, with ultralight 20D recycled polyester fabric.
• Hybrid rectangular shape allows various comfortable sleeping positions.
• Uncompromised comfort and support, with a thickness of 8cm.
• Pump sack included for rapid and hygienic inflation.
• Roll-away stuff sack with repair kit included.
• Equipped with a low-profile two-way valve for rapid inflation and deflation.

Specifications

• Weight: 607g (ex bag)
• 183cm x 51cm x 8cm
• Packed size regular: 24cm x 14cm (9.4in x 5.5in).

Material & Construction

• Embossed 20D recycled polyester with 5.5S TPU coating (LW glue)
• 20D recycled polyester with 5.5S TPU coating (LW glue)
• 800FP European Goose Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (190g /6.7oz)
• 100% Recycled Polyester

Help & advice:

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