Brooks Adrenaline GTS 25 vs Brooks Glycerin Flex

Brooks Adrenaline GTS 25

± Divisive

Softer DNA Loft v3 and a lower 10 mm drop smooth the heel transition and make easy miles more comfortable, but the ride is still firm and short on energy return, and some testers find it dull.

Brooks Glycerin Flex

± Divisive

A flexible, grounded ride that rolls naturally for heel strikers and feels engaging on easy miles, though lab testers find it firm and dull with little propulsion.

Brooks Adrenaline GTS 25

+ Praised

More foam in the heel and forefoot takes the edge off landings and suits daily mileage, though lab tests call it average and the forefoot firms up over longer runs.

Brooks Glycerin Flex

+ Praised

DNA Tuned foam provides generous heel protection and enough cushioning for daily miles, but the forefoot is firmer and less protective under heavy loads.

Brooks Adrenaline GTS 25

± Divisive

A roomier forefoot and soft mesh improve comfort for many, but the tapered toe box, thick warm upper and heavily padded heel collar divide testers.

Brooks Glycerin Flex

± Divisive

A stretchy knit upper that fits snugly and comfortably for many, though its low volume, warmth and gel-pad heel bother some testers.

Brooks Adrenaline GTS 25

+ Praised

Reviewers generally expect a long-lasting daily trainer, with strong outsole wear scores, though one long-term tester saw average wear and early foam compression.

Brooks Glycerin Flex

+ Praised

The rubber outsole and knit upper appear durable, with only average long-term wear concerns around the flexible forefoot.

Brooks Adrenaline GTS 25

+ Praised

Grippy rubber handles wet roads and light paths well, with only the exposed foam limiting off-road use.

Brooks Glycerin Flex

+ Praised

Sticky outsole rubber grips wet and dry roads well, and the flexible forefoot keeps ground contact predictable.

Brooks Adrenaline GTS 25

+ Praised

GuideRails and a broad, flared base give noticeable but unobtrusive medial support that holds up when form fades.

Brooks Glycerin Flex

± Divisive

A wide, firm platform gives decent lateral stability, but the highly flexible neutral design asks more of the foot and offers no guidance.

Brooks Adrenaline GTS 25

± Divisive

At $155 it is fairly priced for a durable stability trainer, though some reviewers say lighter, livelier rivals offer more for similar money.

Brooks Glycerin Flex

− Criticised

At $170 it is expensive for a niche flexible trainer, and reviewers see only fair value unless the unusual ride is exactly what you want.