Hypersphere Ultra 7.5 Sleeping Mat – Long 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 (Long/Wide) is a premium choice for fast-moving adventures in extreme cold. Weighing 824 grams, it retains an impressive R-value of 7.3, offering outstanding insulation for winter alpine climbs and arctic expeditions without adding unnecessary bulk.

With an 8cm thickness and a longer, wider profile, this version provides more room to stretch out—ideal for taller users or those who prefer extra space. Oversized outer chambers help keep you centred throughout the night, reducing the chance of rolling off. The 800-fill power goose down effectively traps heat, maximising warmth. Inflation is quick and effortless with Rab’s included pump sack, ensuring a hassle-free setup after a demanding day in the mountains.

For those prioritising warmth, weight, and comfort, the Hypersphere 7.5 (Long/Wide) strikes an excellent balance between insulation and packability. It’s a reliable companion for high-altitude missions and extreme conditions, delivering superior performance without compromise.

– Reviewed by Ultralight Outdoor Gear

Features

• Impressive warmth for weight, with an R-value of 7.3 and a weight of just 824g.
• 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: 824g (ex bag)
• 196cm x 64cm x 8cm
• Packed size long wide: 28.5cm x 15cm (11.2in x 5.9in)

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