I have been running in Glycerins or similar Brooks for 6 years, these are completely different and Amazing. It’s either the extremely light weight, or the carbon plate, or the rounded toe and heel, who knows, but they are Fast. They also like a high speed to feel natural, anything faster than a 8:00 min mile and they really start to do what they were made to do- the shoe Becomes more efficient at higher speeds.
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