Nike's Hyperwarm Flex baselayer is looking to change the game by using a new knitting process that combats the effects of cold winter training and helps you maintain a peak level of performance.

In this week's episode of the STACK Rundown, we take a look at Nike's brand new Pro Combat Hyperwarm Flex collection.

Nike introduced its 2014 base layer products this week, which the company bills as an athlete's answer to "extreme heat and cold, wind and precipitation," i.e. the Nike Hyperwarm kits that are ...