Brooks Glycerin 22 vs Brooks Glycerin GTS 23:
Which to Choose

Underfoot these two feel remarkably alike: both ride on roughly 38–39mm of soft, high-cushion DNA Tuned foam with a traditional 10mm heel-to-toe drop, no plate, and a moderate-not-propulsive spring that rewards relaxed rhythm and dulls when you force the pace. The differences are structural rather than dramatic. The GTS 23 threads GuideRails support into that same platform, pushing its stability from moderate to high — it stays planted and gently checks excess motion without ever feeling corrective or clunky, which is exactly what a mild overpronator wants. That support (plus a dual-cell midsole with a slightly firmer, more supportive forefoot push at toe-off) adds weight: the GTS 23 comes in around 306g in a men's US 9 versus roughly 289g for the neutral Glycerin 22, so the 22 feels a touch lighter and freer on the foot. Range differs slightly too — the Glycerin 22 stretches comfortably from easy miles up through the marathon, while the GTS 23 is happiest on steady daily and recovery runs and tops out around the half. Neither is a tempo or race shoe; both go vague if you push much past easy-steady effort.