Rab Ultrasphere 4.5 Sleep Mat (370g)

Regular price $299.95


From bikepacking through mountain ranges to multi-day trail running, the award-winning Ultrasphere 4.5 offers peerless warmth for when you can’t compromise on weight.

Weight : Regular 370g, Long Wide 505g
Packed Size : Regular 15cm X 9cm, Long Wide 19cm X 9cm
R-Value : 4.3
Repair Kit Included


We recommend using this for:

  • Expedition
  • Fast & Light Adventures
  • Mountaineering
  • Trekking

When both warmth and low weight are crucial, the award-winning Ultrasphere 4.5 is the ultimate packable, featherlight air mat. Its ground-breaking design includes two layers of heat-reflective TILT, which reduce radiant heat loss, and offset air chambers that trap heat within the construction, allowing you to recharge comfortably without the need for high-volume insulation. Combined with a soft, exceptionally lightweight fabric, the mat’s weight-saving construction makes it ideal for bikepacking, thru-hiking, and multi-day mountain running.

With a comfortable tapered mummy shape that eliminates unnecessary bulk, the mat is thick and supportive, so that you can catch vital rest and restore the energy reserves needed for your action-fuelled days on the trail. When it’s time to pitch for the night, the low-profile two-way valve and inflation sack make camp setup quick and easy.

Featuring an included repair kit and unrivalled warmth-to-weight ratio, the Ultrasphere 4.5 is honed for fast-paced exploring in demanding mountain conditions.

  • Weight:Regular 370g / 13.1oz. Long Wide 505g / 17.8oz
  • Main Fabric:20D Recycled Polyester outer fabric with internal TPU Coating and fluorocarbon free DWR
  • Dimensions:Regular: 183cm x 51cm x 8cm. Long Wide: 196cm x 64cm x 8cm
  • R-Value:4.3
  • Packed Size:Regular 15cm x 9cm (5.9in x 3.5in) / Long Wide 19cm x 9cm (7.5in x 3.5in)
  • Product Code:QMA-06
  • 2 layers of TILT reflective film help reduce radiant heat loss without adding weight or bulk
  • Offset weight saving internal cut outs help disrupt the flow of convection currents and keep warm air static
  • R-Value: 4.3
  • Thickness: 8cm
  • Packed size: 18x9cm
  • Tapered mummy shape to save weight
  • Low profile two-way valve for easy inflation and deflation
  • Pump sack included for rapid and hygienic inflation
  • Roll-away stuff sack with repair kit included

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