Rab's ULTRASPHERE 4.5 REG mattress is a must-have accessory for multi-day adventures in low-temperature wilderness.

Ultralight, weighing just 370 g, and ultra-compact, it slips discreetly into your backpack or bikepacking panniers. It offers excellent overnight comfort thanks to its 8 cm thickness and compartments that optimize weight distribution. What's more, it incorporates two layers of TILT reflective film that pushes the R-value to 4.3 for effective insulation and amplifies the warmth of your sleeping bag by limiting thermal bridges.

It's made from 20D recycled polyester and coated with a fluorocarbon-free DWR water-repellent treatment. Its contoured shape adapts to your sarcophagus sleeping bag and saves a few grams.