Rab Hypersphere Sleep Mat

An R-value of 9.5 is exceptionally high, designed specifically for expedition-level mountaineering and sub-zero temperatures. It provides a robust thermal barrier against frozen ground, ensuring you stay warm even when camping on snow or ice.

While the 650FP duck down provides incredible warmth-to-weight efficiency, it is protected by the mat's durable 75D recycled polyester shell with a TPU coating. This construction helps shield the insulation from external moisture, though you should always ensure your tent setup prevents condensation buildup.

The included pump sack is designed for efficient, hygienic inflation, typically taking just a few minutes to fill the mat. It prevents moisture from your breath from entering the pad, which helps protect the down insulation over the long term.

Yes, the mat features oversized outer chambers that act as rails to keep you centered. Combined with the 10cm of thickness, this design provides excellent support and stability, even if you shift positions throughout the night.

The Hypersphere comes with a dedicated repair kit included. It is lightweight and easy to pack, allowing you to perform quick, reliable field repairs if you encounter a sharp rock or ice crystal.

At 1.85 lbs, this mat is built for durability and extreme warmth rather than ultralight speed. While it is packable, it is best suited for mountaineering and expedition trips where thermal performance and comfort in harsh conditions are the priority.