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Rab Ultrasphere 4.5 Sleep Mat (370g)

As low as $138.98
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The Rab Ultrasphere 4.5 Sleep Mat (370g) is an award-winning air mat that's extremely warm and insulating despite its low weight and size. Two layers of heat-reflective TILT combined with offset air chambers radiant heat back towards your body and trap excess heat, keeping you warm without any bulky insulation. That means extra warmth without the extra weight or pack size. Great for backpacking, thru-hiking, and multi-day mountain runs in milder conditions.


  • Tapered mummy shape to save weight and bulk
  • 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
  • 2 layers of TILT reflective film help reduce radiant heat loss without adding weight or bulk
  • Offset weight-saving internal cutouts help disrupt the flow of convection currents and keep warm air static

Tech Specs:

  • Main Fabric: 20D Recycled Polyester outer fabric with internal TPU Coating and fluorocarbon-free DWR
  • Weight: 370g / 13.05oz
  • 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)
  • Thickness: 8cm
  • Packed size: 18x9cm

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