The Montrail FluidFlex ST is a 9.4 oz/ 266 gram 22mm heel/18mm forefoot trail runner with a stable supportive ride. $95, so a very good value compared to many 2015 trail runners. Lightweight and agile, the overall package has a substantial seamless upper, great rock protection and an innovative variable density midsole, the Fluid Frame. While the shoe is called out for "over pronators" this resolutely neutral runner, who can't stand stability and support features in most shoes, found the firmer mid foot midsole foam just right for rougher trail stability and confidence. I sized up half a size and fit is perfect.
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Montrail FluidFlex ST |
I have run up to 16 miles on easier smooth Utah trails, some roads, and rough, rooty, rocky NH trails. The FluidFlex ST handled all terrain with ease and comfort but one would say, if used as road trail hybrid, it would lean towards trail. While I have not run in the Fluid Flex the key difference between the 2 shoes is the FluidFrame midsole and its increased stability
Fluid Frame
The special sauce in the FluidFlex ST is the midsole.