Preorder the Brooks Glycerin Flex; release date: February 1. The Shoe Changing the Paradigm Brooks Glycerin Flex $170 Brooks Running Type Road Weight 9.4 oz (M), 7.3 oz (W) Drop 6mm Stack Height 36:30mmA week ago, I demonstrated to our video team what separates the Glycerin Flex from the other trainers we’re currently testing. The Glycerin was an interesting choice as a first Flex shoe—but minimalism wasn’t the goal with the Glycerin Flex. Running in the Glycerin FlexSo how does it feel running in the Glycerin Flex? Because the Glycerin Flex is a part of the Glycerin family, completely different from the Glycerin Max, I had to have her try it out.