Built for true deep-winter missions, Mountain Spring R9 four-season inflatable mat delivers an exceptional R-value of 9 at just 680 g—an ultralight package with serious cold-weather performance. The dual-core thermal design combines reflective film with internal insulation to lock in warmth, so you stay insulated from frozen ground on long alpine pushes, snow camps, and high-latitude routes.
A supportive 3D profile keeps pressure even and contact noise low, while the durable 30D nylon shell stands up to rough surfaces. The dual-layer valve makes setup straightforward and deflation fast, and the compact pack size rides easily in a side pocket or small winter kit. If you’re chasing the highest warmth-to-weight performance, this pad sets a new benchmark for efficiency in the cold.
