Comparison

Brooks Adrenaline GTS vs. ASICS Gel-Kayano: Which Is Better for Flat Feet?

By Arshak Nersisyan · Published July 17, 2026 · 6 min read

Both are among the most recommended stability shoes for flat feet, and both show up on our running shoe guide. Here's how they actually differ once you put miles on them.

Support: guided vs. structured

The core difference between these two shoes comes down to how they manage overpronation. The Adrenaline GTS uses external guide rails along the heel and forefoot to gently limit excess motion without a rigid post underfoot — it lets your foot move somewhat naturally while cutting off the extremes. The Gel-Kayano takes a more traditional approach, with firmer, more noticeable support built into the midsole itself.

In practice: if your arch collapses mildly, the Adrenaline GTS often feels like "enough" support without feeling restrictive. If your arch collapses significantly, the Kayano's firmer structure may feel more reassuring — and the Adrenaline GTS may start to feel insufficient over longer distances.

Cushioning and ride feel

The Gel-Kayano's top-layer cushioning is noticeably plusher, which helps offset its firmer support structure. The Adrenaline GTS's ride is more balanced and slightly firmer overall — some testers find that gives better ground feedback, while others prefer the Kayano's plush step-in feel.

Fit and sizing

Both run true to size for most feet. The Kayano's midfoot has run slightly narrower for us across recent versions, which is worth knowing if you have a wider midfoot alongside your flat arch. Both offer wide width options, which matters since flat feet often pair with a broader forefoot.

Durability

Both hold up well over 300+ miles of combined running and walking in our experience, with the Kayano's outsole rubber lasting marginally longer — a small factor given its higher price point evens things out.

Our verdict

Choose the Adrenaline GTS if your overpronation is mild-to-moderate and you want one shoe that works for running, walking, and standing without feeling overbuilt. Choose the Gel-Kayano if you have more significant arch collapse, run higher mileage, or have already found gentler stability shoes don't cut it.

Frequently asked questions

Which is more supportive: Adrenaline GTS or Gel-Kayano?

The Gel-Kayano generally offers firmer, more structured support, making it a better fit for moderate-to-severe overpronation. The Adrenaline GTS provides a gentler, guided form of support that suits mild-to-moderate overpronation.

Which shoe is better for everyday walking, not just running?

Both work well for walking. The Adrenaline GTS feels slightly lighter and less structured for casual, all-day wear, while the Gel-Kayano's firmer support may feel like more shoe than needed for simple walking.