Engineered for cold-weather performance in a compact, lightweight package, the Rab Ionosphere 5.5 is an insulated air mat designed for alpine and winter adventures. Built to deliver reliable warmth and comfort in harsh environments, it’s ideal for everything from frozen bivouacs to multi-day ski tours and high-altitude expeditions.
Featuring a heat-reflective TILT lining, the mat reflects radiant body heat back towards you, reducing heat loss during cold nights. Combined with Stratus™ R insulation, which traps air to minimise convective heat loss, it provides effective insulation from frozen ground and snow. This dual-technology approach ensures consistent warmth without adding unnecessary bulk.
Despite its strong thermal performance, the Ionosphere 5.5 remains lightweight and highly packable, making it perfect for fastpacking, ski touring, and technical alpine missions where space and weight are critical. Designed for durability and comfort, it delivers dependable sleep performance in demanding winter conditions.
FEATURES:
- The TILT reflective film inside the mat reduces radiant heat loss, boosting warmth for weight.
- Stratus™ R insulation traps air to prevent heat escaping through convection.
- Soft-touch, lightweight 20D fabric on the upper mat, with a 30D base for added durability on rough ground.
- Oversized outer chambers to keep you central on the mat.
- The versatile rectangular shape is comfortable whatever your preferred sleeping position.
- Inflation and deflation are quick and easy thanks to the low-profile two-way valve and pump sack.
- R-value: 5.5.
- Thickness: 8cm.
- Roll-away stuff sack with repair kit included.
- Dimensions: Regular 183x51cm. Large 196x64cm.
- Packed size: Regular 24x12cm. Large 30x14cm.
SPECIFICATIONS:
Weight: 615g/21.7oz (Reg)
Insulation: Stratus™ R insulation traps air and reduces heat loss from convective currents
Dimensions: Regular: 183cm x 51cm x 8cm. Long wide: 196cm x 64cm x 8cm.
R-value: 5.5
Packed size: Regular: 24cm x 12cm (9.4in x 4.7in). Long wide: 29cm x 14cm (11.4in x 5.5in)
Product code: QMA-11
