The Novablast and the Kayano both have FF Blast+ Eco midsoles but the Novablast midsole is firmer. This makes it more suited to uptempo runs such as tempo runs, intervals and races because it's easier to pick up the pace in the Novablast.
The Kayano is more suited to slow runs such as easy and recovery runs because of its softer midsole. It's also better for long runs because it has more long-distance comfort.
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