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What is an R-value?The R-value is a measure used to rate how well your sleeping mat will stop heat loss. Thermal resistance is the measurement that indicates a materials ability to insulate - there are a number of different ways to express this but, as they all measure the same factor, they are all related. The starting point is the R-value.In the past, some brands quoted the R-value in SI units, …

What is Hydrostatic Head?Hydrostatic Head (HH) is a way of measuring how waterproof a fabric is. The resulting measurement in millimetres relates to how high a column of water standing on the fabric would need to be before the water would penetrate the fabric. For the best fabrics results can be as high as 30,000mm, i.e. 30 metres high, before it would penetrate the fabric.For the best fabrics res …