Thermajock. Yes, yes, yes...it is, in fact, what you think it is. The third sock, if you will, that you slip on before heading out in the cold. And just in case you still have no idea what this is or how it works, enjoy these wonderful step by step instructions (not to spoil the fun, but I would categorize as NSFW). And I don't mean to judge...ok I do - WTH people? Seriously? Well god bless if this product is an answer to your frost bitten prayers. All I can say at this gift giving time of year is that Thermajock gives new meaning to the term "stocking stuffer."