ASICS was founded in Japan in 1949. Saucony was founded in the United States in 1898. Both have been making running shoes for long enough that their reputations are built on product, not marketing.
ASICS uses FF BLAST foam across much of their current range. Saucony uses PWRRUN. Both are proprietary formulations engineered for cushion and energy return. In running specialist communities, PWRRUN is generally considered more responsive than standard FF BLAST. ASICS' premium FF BLAST+ is closer in character to Saucony's PWRRUN+.
| Saucony | ASICS equivalent | Difference |
|---|---|---|
| Ride 17 | Gel-Nimbus Lite | Similar daily trainer role |
| Triumph 22 | Gel-Nimbus 26 | Both premium neutral; similar stack |
| Guide 17 | Gel-Kayano 31 | Both stability; Kayano is more structured |
| Endorphin Speed 4 | Metaspeed Sky+ | Both performance; different plate materials |
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Source: brand specifications from saucony.com and asics.com.