Brooks Glycerin Flex vs Glycerin 23

Glycerin Flex or Glycerin 23? Here’s how they compare on feel, fit, brand specs and price, from the fitting team at The Run House.

The short answer

Want Glycerin comfort with a more flexible, connected feel? Get the Glycerin Flex.

Want plush, pillowy comfort? Get the Glycerin 23.

Get the Glycerin Flex if

• You like a firmer, more stable feel
• You have slimmer feet and like a snug fit
• You like a flexible, natural-feeling forefoot
• You want the lighter shoe, by about 1.5 oz

Get the Glycerin 23 if

• You want the softer, more cushioned ride
• You want a dedicated recovery-day shoe
• You need a roomier fit
• You like a bit more structure under the forefoot

On the run

Glycerin Flex: The flexible Glycerin. Comfortable and stable at the heel, with a midfoot flex groove that makes it more flexible than the regular Glycerin. The ride is on the firm side with little bounce.

Glycerin 23: The plush luxury cruiser. Deep, plush cushioning with a soft heel. It’s built for comfort, not speed, and the forefoot needs a couple dozen miles to loosen up.

Specs side by side

Stack, drop and weight come from each brand’s own website. Numbers marked * aren’t published by the brand and come from other published specs. Weights are for the size each brand quotes. Expected life is our estimate.

Fit

Glycerin Flex. True to size with a premium knit upper and secure lockdown. Best for narrow feet; the toebox is narrow.

Glycerin 23. Runs slightly short, so if you’re between sizes, go up a half. Roomy forefoot with more toe height than the 22; the stretchy upper can feel loose on narrow feet. Wide available.

Try them on

Come try on both at The Run House in Walpole, Needham or Falmouth. Gait analysis is always free.

Shop the Glycerin Flex · Shop the Glycerin 23 · Compare other running shoes