PWRRUN PB foam is genuinely cushioned despite its responsive character. Some runners find it more comfortable for daily use than a standard trainer because the energy return reduces perceived effort. If budget allows only one pair, the Speed handles all training adequately.
Running shoe rotation extends the life of each shoe. PWRRUN PB foam is more expensive to produce than PWRRUN — and it costs accordingly. Using the Speed for easy runs when a less expensive shoe would do the same job is inefficient. A Ride for easy and long runs and the Speed for quality sessions is the standard approach.
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Source: Saucony Endorphin Speed specifications from saucony.com.