Call them what you want, but where I live in upstate New York they are worn by 90% of the female population ages 9-90. Now that it is getting colder they are still wearing them, and some even with winter jackets. I wonder how long they will keep wearing them? Is this some kind of new cinnamon/tide pod challenge or something?
Living things are thermally active and they generate heat. When something has thermal conduction it means that it can allow the transfer of energy in the form of heat from one body to another. Thermal insulation is aimed to reduce that thermal conduction. The reason that we need insulation is to make sure that the energy our bodies work so hard to make by consuming food will not just be conducted to the air without our having benefited from it at all. If we don’t insulate ourselves from a cold environment, we will need to consume huge amounts of food, to be turned into energy, in order to sustain our bodily functions, but we probably wouldn’t be able to keep it up for long. What this means is that the result of not having enough insulation is more energy production. You can think of it in terms of house heating. If a house is not insulated well, heat escapes and you need to crank up the heat to keep it comfortable, burning more fuel.
Air is the best insulator we have managed to find so far, as the rate of lost energy on the outside takes a long time to reach the inside, allowing for very slow heat conduction. When it comes to using trapped air for insulation there is a very simple rule, with the more air that there is between the two bodies, the better the insulation is. The main issue with yoga pants is there is no trapped air and it just conducts and dissipates. While retailers and brands alike try to tell us that their tights are super thermal, there is no such thing. The only way it would work is as a base layer, so why are we still seeing them? Base layers will keep you warmer than being naked, or even wearing a t-shirt, but a real base layer is not meant to keep you warm. It will only keep us nice and toasty with the added bulk of an outer layer.
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