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7

Yes, the R-value will add of your different layers. If you wear layer A with R=5 and layer B with R=2.5, the overall insulation value will be R=7.5. To explain this a bit, we think of two layers or flat walls which interact only due to thermal conduction. This is just a model and in reality other effects will come in play. The Fourier Law for thermal ...


3

Coming from an "enjoying nature" perspective, the equation becomes more simple in my estimation. If the trail can be expected to be reasonably well packed down, boots are perfect, traction cleats can be slipped onto boots if the hike is especially steep or slick. If the trail is expected to be deep powder, not hard pack snow.. snow shoes are easily the best ...


2

According to wikipedia2 In calculating the R-value of a multi-layered installation, the R-values of the individual layers are added. I would imagine a slight diminishing return as the r-value is a laboratory measurement in ideal condition which is not quite the same as on the field (variable temperatures, moisture, air movement, etc.).



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