R-Value

R-Value

R-Value is a physical metric that indicates the thermal resistance of a material. The higher the R-Value, the better the material insulates. This value is crucial when selecting a sleeping pad or mattress for outdoor activities.

How is R-Value Measured?

R-Value is determined in laboratory conditions using test chambers, where a mattress is placed between two metal plates that simulate contact with the ground and the user’s body. The amount of energy required to maintain a stable temperature is measured, determining the thermal insulation capacity.

How Does R-Value Affect Equipment Selection?

• R-Value 1.5 or less – Minimal insulation, suitable for warm weather only.
• R-Value 2–3 – Designed for three-season use (spring, summer, fall).
• R-Value 3–5 – Good thermal insulation, suitable for colder conditions.
• R-Value 5 or more – Intended for winter camping and extreme conditions.

Optimizing the Sleeping System

A proper combination of a sleeping bag and a pad with an appropriate R-Value ensures thermal comfort while minimizing the carried weight. For example, a lighter three-season sleeping bag can be paired with a higher R-Value pad instead of carrying a heavier winter sleeping bag.