I'd like to repeat, for the record, that I was wearing my Chrome Cobra, as an outer layer, in temps below -5°, with windchills below -25° just the other night. With a merino baselayer and a sweater as a midlayer I was toasty. Like, very comfortable. Not just OK, toasty. But, hey, if you like sweating and getting cold/clammy in synthetics with no breathability, go for it.