Rab Ultrasphere 4.5 Sleep Mat (370g)

When a balance of warmth and minimal weight is essential, the award-winning Ultrasphere 4.5 emerges as the go-to ultralight, packable air mat. Crafted for efficiency, it features a pioneering design that includes dual layers of heat-reflective TILT to minimise radiant heat loss. The offset air chambers work cleverly to retain warmth within the mat's structure, eliminating the need for heavy insulation and allowing for restorative rest in colder conditions. Its soft, featherweight fabric and space-saving design make it an exceptional companion for fast-paced pursuits such as bikepacking, thru-hiking, or multi-day mountain running adventures.

The mat's tapered mummy profile is shaped for efficiency, trimming away excess material without compromising on comfort. Its generous 8cm thickness ensures reliable support for tired muscles after long days in the mountains. When it’s time to settle down at camp, the streamlined two-way valve and included pump sack simplify the inflation process, making setup both quick and hygienic.

With a repair kit included and an outstanding warmth-to-weight ratio, the Ultrasphere 4.5 is purpose-built for rapid, lightweight travel in challenging alpine environments.

Though it pairs seamlessly with any sleeping bag, the Ultrasphere 4.5 can also be matched with the Mythic Ultra 120 Modular bag to create an ultra-minimalist sleep system that weighs in at under 700g.

Features

• Two layers of TILT reflective film significantly reduce radiant heat loss without adding unnecessary weight or volume.
• Internal offset cut-outs reduce overall weight while disrupting convection currents, helping to keep warm air static within the mat.
• The R-Value is rated at 4.3, offering reliable insulation in cold conditions.
• The mat has a generous 8cm thickness for enhanced comfort and support.
• When packed down, it measures just 18 x 9cm for efficient stowage.
• The tapered mummy shape reduces weight without sacrificing sleep quality.
• A low-profile two-way valve allows for quick and controlled inflation and deflation.
• The included pump sack provides rapid, hygienic inflation without the need for breath.
• It comes with a roll-away stuff sack and a repair kit to support long-term use in the field.
  
  

Sustainability Features

• Fluorocarbon (PFAS) free fabric
• Fluorocarbon (PFAS) free product
• Made with renewable energy
  
  

Specifications

Technology

TILT (Thermo Ionic Lining Technology)

This innovative heat-retention technology functions similarly to an emergency blanket by reflecting body heat back towards the wearer while still allowing for breathability and comfort. By enhancing thermal efficiency, it provides essential warmth when temperatures drop significantly.

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