So I bought into the whole omniheat marketing which it turns out to be nothing more than marketing: just wearing it at home w/o heat, I feel no warmer than my other baselayers and actually have felt a little colder. Maybe you need to generate a lot of heat to make it the reflecting dots work (and if so, I'd never be warm!)? In any case, I'm also skeptical of the longevity of the omniheat dots as they seem to be stuck on; I can only imagine how
many wash cycles and uses it can take before they start to peel off. The sizing is very off as well, it seems like they were made for short fat people. At 6'2" ~36" inseam, all my pants and bottoms are Larges and they all have the length to go with it. Not so for this layer: they're very short, like a size Small if I had to compare it to any other manufacturer. If I these were the size of my jeans they would look like ones I wore when I was 12 or 14 or whenever.
Bottom line: Omniheat doesn't seem to work outside of marketing, longevity is a concern, sizing is completely off.