The Magic Speed 4 features a dual-density midsole with FF Blast+ for durability and FF Turbo+ for energy return, while Speed 3 has a simpler design.
The Speed 4's thicker midsole provides more cushioning, making it better for long runs, but its added weight and height disqualify it from official World Athletics races.
While the Speed 4 feels more efficient with a stiffer carbon plate, the Speed 3's lightweight and nimbleness make it preferable for shorter distances.
For runners needing more stability, the Magic Speed 3 is advantageous due to its thinner midsole and closer-to-ground feel, reducing lean bias during runs.
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