Brooks Cascadia 18 Sizing Guide: Does It Run Small or True to Size?

Fit Notes

Brooks Cascadia 7

The Cascadia 8 features a redesigned upper with increased internal volume, creating a wider and slightly longer feel compared to the Cascadia 7. Runners who prefer a highly locked-down, high-precision feel may want to size down a half-size, while ultra-runners appreciating natural toe splay should stay true to size. Address the compensation factor: if you previously sized up in the narrow Cascadia 7 just to secure extra width, you can safely return to your true length in the Cascadia 8 due to its inherently roomier forefoot structure.

New Balance Leadville 1210

The Leadville 1210 is designed with a wider, higher-stack, and overall roomier fit that runs roughly a half-size large. To maintain adequate toe clearance, runners must size up a half-size in the more precisely fitting Cascadia 8. Because the Leadville 1210 runs large in length, sizing up in the Cascadia 8 is a length compensation rather than a width compensation, ensuring your toes do not impact the front wall.

Salomon S-Lab 4

The Salomon S-Lab 4 features a narrow, straight upper profile that limits metatarsal expansion and features a higher heel-to-toe drop. In contrast, the Cascadia 8 offers a more natural, anatomically compliant upper flex and wider forefoot splay in the same size. Consider the compensation factor: if you normally size up in the narrow S-Lab 4 just to get more width, you should return to your true length in the Cascadia 8, as its roomy toe box provides lateral relief without requiring excess length.

Asics Gel-Trabuco

The Gel-Trabuco features rigid plastic ribs and a straight upper profile that can cause friction and hot spots over long distances. The Cascadia 8's asymmetrical upper is superior in flexibility, conforming more naturally to the foot as it flexes. Both models share a comparable length baseline, so users should buy their standard true size unless they require extreme width accommodations.