AS TECHNOLOGY ADVANCES, for certain products, there seem to be headline figures that sum up the continued progression in a nutshell. It could be megapixels for cameras, CPU speeds for computers, or resolutions for TVs. The outdoors industry is no exception, be it the lowest weights for tents, most lumens for headlamps, and for sleeping mats, highest R-values. And, for that last example, the latest salvo has been fired by Nemo Equipment, whose new Tensor Extreme Conditions (EC) Ultralight Insulated Sleeping Mat has a highest-in-the-market-for-ultralight-mats R-value of 8.5. That’s right, an incredible 8.5! Yes, there are mats with higher R-values still, but they’re not ultralight, and are far too heavy and bulky for anything but car-based camping.
Now, in case you’ve forgotten exactly what R-value means, it’s a measure of…