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Rab Ultrasphere 5 Sleep Mat (345g)

Rated 5.00 out of 5 based on 1 customer rating

5.0 (1 review)

Price range: $299.95 through $329.95

When both warmth and low weight are crucial, the Ultrasphere 5 is the ultimate packable, featherlight air mat, honed for fast-paced exploring in demanding mountain conditions. Its groundbreaking design includes two layers of TILT, which boosts the mat’s warmth-to-weight ratio by reflecting heat back towards your body, all for a fraction of a gram. It also features new offset air chambers that trap heat within the construction, allowing you to recharge comfortably without the need for high-volume insulation. Highly comfortable and supportive, the Ultrasphere 5 is the ideal foundation for thru-hiking, bikepacking, and multi-day mountain runs.

R-Value 5.5

Size

Clear

SKU: N/A Categories: Sleeping Gear, Sleeping Mats & Pads

Brands: Rab

Brand: Rab

Features

Impressively light at just 345g (size regular), with uncompromised warmth at an R-value of 5.5.
The new weight-saving construction uses offset air chambers to trap heat and keep you warm.
Two layers of heat-reflective TILT reduce radiant heat loss without adding weight.
Comfortable tapered mummy shape that eliminates unnecessary bulk.
Soft, exceptionally lightweight 20D fabric.
When it’s time to pitch for the night, the two-way valve and inflation sack make camp setup quick and easy.
Thickness: 8cm.
Packed size: 18x9cm.
Roll-away stuff sack with repair kit included.
Tapered mummy shape to save weight
Low profile two-way valve for easy inflation and deflation
Pump sack included for rapid and hygienic inflation

Specs

Weight: Regular 345g
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: 5.5
Packed Size: Regular 18cm x 9cm (5.9in x 3.5in)

Additional information

Size	Regular, Regular Wide, Long Wide

1 review for Rab Ultrasphere 5 Sleep Mat (345g)

5.0

Based on 1 review

5 star	100	100%
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Jennifer Amosa – April 10, 2026

Rated 5 out of 5
Very comfortable night’s sleep on the regular wide sleep mat. Lightweight and very easy to inflate and deflate. Excellent service (as usual) from Warren too! 🙂