This is an excellent shoe. I've been using it for runs ranging from 8 to 16 miles [and will be using for longer runs as marathon training ramps up]. For such a high stack, it is surprisingly nimble. This shoe has become a key part of my marathon training equipment. Shorter run days include the Glycerin 22 [also excellent] and track days include the Hyperion Max [also excellent] The Glycerin Max is responsive, phenomenal cushioning without being squishy, and very comfortable. Thus far I've logged 90 miles in these and I'm very impressed.
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