The Glycerin Max features Brooks' newest foam, DNA Tuned, designed to be softer and lighter, providing improved long-distance comfort and impact protection compared to the Glycerin 21.
While the Glycerin Max excels in plushness and softness, the Glycerin 21 offers a more balanced ride, capable of handling faster paces better with its denser DNA Loft v3 foam.
The Max's unique structure with bigger rearfoot cells provides softer landings, but the Glycerin 21's configuration assists in stability, as it has a firmer ride and sits lower to the ground.
In terms of durability, the Glycerin 21 outperforms with more rubber on the outsole, translating to better protection for the midsole foam from road impact.
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