Brooks Glycerin Flex

Runnertia observes the Brooks Glycerin Flex uses a super critical EVA foam that is neither particularly soft nor particularly bouncy, feeling almost like a standard EVA, maybe slightly elevated from normal EVA.

Runnertia finds the foam in the Brooks Glycerin Flex is not on par with the current market of running shoe foams.

Runnertia finds the foam in the Topo Specter 3 is generations beyond the foam in the Brooks Glycerin Flex, and that the Specter 3 performs much bouncier and more energetic.

Marathon Handbook finds that the DNA tuned foam in the Glycerin Flex is light, responsive, and comfortable.

MidLife Runner finds the Brooks Glycerin Flex not particularly soft and hopes for the 'Dull Brooks bounce.'

Meta Endurance states the midsole technology of the Brooks Glycerin Flex is DNA Tuned, the same material Brooks introduced on the Glycerin Max in 2025 and carried over to the Glycerin Flex and Glycerin 23 in 2026.

Meta Endurance describes the DNA Tuned midsole of the Brooks Glycerin Flex as a combination of bigger cells on the outer side and smaller cells on the inside, with the smaller cells being less dense and softer, providing comfort, and the larger cells providing structure and stability by wrapping the smaller cells.

RoadTrailRun states that the Glycerin Flex uses DNA Tuned foam midsole, a dual foam with smaller cells in the front and bigger in the back.

Sagasu Running states the Brooks Glycerin Flex uses Brooks's co-molding technology (which he previously observed in the Glycerin Max) in a new foam called DNA Tuned, giving plushness in the heel but responsiveness and firmness off the toe.

Nikquille states the Glycerin Flex uses DNA Tuned foam, with a softer large-cell configuration in the heel and a more poppy small-cell configuration in the forefoot.

RoadTrailRun observes that the Glycerin Flex uses Brooks' DNA Tuned midsole technology: large cell (white) in the heel for soft landings and small cell (green) in the forefoot for responsive toe-offs.

Runnertia observes the Brooks Glycerin Flex costs $170 and finds that price mind-boggling for what you are getting in the shoe.

Runnertia finds the Brooks Glycerin Flex's $170 price to be 'ludicrous for what this provides.'

Runnertia states they did not hate the Brooks Glycerin Flex but that it is not worth $170; they believe it should be priced around $120.

Runnertia states that at the $170 price point, literally nobody should consider the Brooks Glycerin Flex as an option compared to the Topo Specter 3.

Meta Endurance states he probably would not pay $170 for the Brooks Glycerin Flex because he feels there are more options in Brooks' lineup (like the Glycerin 23) that are worth his money more, and he would pay in the ballpark of $150–$155.

Runnertia observes that even in a size 10 (the larger of the reviewer's two sizes), the Brooks Glycerin Flex has a pretty narrow fit across the forefoot and even midfoot.

Runnertia observes that the Brooks Glycerin Flex (a size 10) was a little narrow on them in their larger of two sizes.

Runnertia finds the Brooks Glycerin Flex does not fit quite right, and argues that given the flexible forefoot concept, one would expect a wider-fitting toe box to be consistent with minimalist precepts.

Runnertia observes that while the Brooks Glycerin Flex added a flexible forefoot, it still has an extraordinarily narrow toe box.

Marathon Handbook observes that the Glycerin Flex is very comfortable, but the toe box feels a little more narrow than the Glycerin 23, which might be an issue for wider feet.

MidLife Runner finds the fit of the Brooks Glycerin Flex (US men's size 9) a little bit long.

Meta Endurance finds the fit of the Brooks Glycerin Flex is very good.

Meta Endurance finds the fit of the Brooks Glycerin Flex is good, mostly due to the heel but also due to a good last that provides a decent amount of width.

Meta Endurance speculates that people with wider feet could use the Brooks Glycerin Flex because it is on the wider side.

Meta Endurance finds the Brooks Glycerin Flex is a bit short; he would not go half a size up, but it is shorter than most shoes in his size (US 10, EU 45), noting Brooks has a tendency to feel shorter than other brands.

Thomas finds the Glycerin Flex to have one of the best-fitting uppers from Brooks he has ever experienced.

Thomas reports that in the Glycerin Flex he observed great lockdown and good width.

MidLife Runner would use the Brooks Glycerin Flex for peppy easy days and some workouts, and recommends it for people who like doing speed work without a plate.

MidLife Runner speculates that if you are a bigger runner or have long ground contact time without landing midfoot, some of the magic of the Brooks Glycerin Flex may be lost.

MidLife Runner finds the Brooks Glycerin Flex excellent for hill repeats and says it will replace his Nike Rival Fly 4 for hills.

MidLife Runner states the Brooks Glycerin Flex has more underfoot than most racing flats but gives a similar sensation, making it like a more minimal daily trainer capable of picking up the pace.

MidLife Runner would not use the Brooks Glycerin Flex for a long run, even though it has more underfoot than most flats, because it is not meant for long runs.

Meta Endurance reports having lots of fun with the Brooks Glycerin Flex, more than he expected to enjoy.

Meta Endurance finds the Brooks Glycerin Flex picks up the pace very nicely whenever the runner wants to pick up the pace.

Meta Endurance describes the Brooks Glycerin Flex as joyful and lively.

Meta Endurance finds the Brooks Glycerin Flex is a very fun tempo shoe for him personally.

Meta Endurance observes the Brooks Glycerin Flex will go faster and faster with the runner if they are in a mood to go faster.

Meta Endurance states the Brooks Glycerin Flex can go really slow and is a good experience at slower paces, but it has a tendency to make the runner pick up the pace.

Marathon Handbook attributes that some runners who are heavier than the reviewer do not like the flexible feeling of the Glycerin Flex, feeling there is not enough support and snap back on the flex mechanism.

RoadTrailRun observes that on the medial side of the Glycerin Flex, there is a stiffer, more supportive profile.

RoadTrailRun is surprised that the Glycerin Flex is quite stable on the medial sidewall, despite expecting instability from the flexibility.

RoadTrailRun states the Glycerin Flex is a neutral shoe but combines some stability with a lively flex and toe-off.

The Brooks representative distinguishes the Glycerin Flex from a minimal shoe by stating they add support back into the medial side to prevent a too-hyperflexible shoe from making the foot do too much work and risking injury.

The Brooks representative speculates that the medial-side support also cradles the first met head for anyone with late-stage pronation, creating a nice toe-off point.

Nikquille describes that when landing, the Glycerin Flex's flex zone 'locks up' to prevent the foot from overextending, and then as the runner pushes off it resupinates and opens up.

RoadTrailRun observes a very unique flex zone underneath the Glycerin Flex shoe: as the biomechanics of the feet wants to compress and absorb impact through landing, the shoe has a soft open-up flex that unwinds, and then as the runner is toeing off, it locks in place to allow for a stiffer toe off, providing a more supportive toe off.

Runnertia would not personally advocate picking up the Brooks Glycerin Flex unless someone really wants to experience a flexible shoe, noting one could get something from Altra or Topo that would be just as flexible for a lower cost.

Runnertia recommends the Topo Specter 3 as an alternative to the Brooks Glycerin Flex, mainly on price consideration.

Runnertia states the Topo Specter 3 and the Brooks Glycerin Flex are not even sort of similar at all.

Runnertia finds the foam in the Topo Specter 3 is generations beyond the foam in the Brooks Glycerin Flex, and that the Specter 3 performs much bouncier and more energetic.

Runnertia states that at the $170 price point, literally nobody should consider the Brooks Glycerin Flex as an option compared to the Topo Specter 3.

Runnertia recommends the Skechers Arrow Racer as another potential alternative to the Brooks Glycerin Flex, noting it is much lighter, more nimble, still fairly flexible, has more responsive foam, is lower to the ground, and feels very direct and connected.

Meta Endurance states he probably would not pay $170 for the Brooks Glycerin Flex because he feels there are more options in Brooks' lineup (like the Glycerin 23) that are worth his money more, and he would pay in the ballpark of $150–$155.

Meta Endurance compares the Brooks Glycerin Flex to the Hoka Clifton 9, Adidas Evo SL, Brooks Hyperion 3, and New Balance Rebel, describing them as very versatile shoes without a plate and representing a new trend of running shoes.

Runnertia finds that while the upper of the Brooks Glycerin Flex feels premium, it also feels warm on foot.

Runnertia observes the Brooks Glycerin Flex has a thick upper that feels very premium to the touch but feels thick on foot.

Meta Endurance finds the upper material of the Brooks Glycerin Flex is a semiflexible material that is not the most comfortable Brooks has recently put on their uppers against the skin or foot.

Meta Endurance finds the tongue of the Brooks Glycerin Flex is not the best Brooks has done recently and is more minimal compared to the Glycerin 22 or Glycerin 23.

Meta Endurance finds the laces of the Brooks Glycerin Flex are thick, premium, and hold up well, with no issues, shafting, or blisters encountered.

Sagasu Running finds that the Brooks Glycerin Flex is a shoe they are excited about, but overall they find it 'fine' and 'good', while noting there are better options or shoes they would rather run in.

Marathon Handbook states that two of the best running shoes of 2026 so far come from Brooks, one of which is the Brooks Glycerin Flex.

Marathon Handbook finds the Glycerin Flex a much better shoe than expected and expresses belief in its future, expecting to see a Glycerin Flex 2, 3, and 4.