At A Glance: 2 mm more foam in the forefoot GuideRails support that doesn't feel restrictive Smooth, controlled ride for weekly mileage Product Highlights: Built for runners who want soft cushioning without sacrificing stability, the Glycerin GTS 23 combines DNA TUNED foam with Brooks' GuideRails support system. The nitrogen-infused midsole adds 2 mm more foam in the forefoot, blending plush landings with energetic toe-offs. The trademark GuideRails help limit excess foot movement (overpronation) to keep your stride feeling natural and controlled, even as fatigue sets in. A broad, stable base enhances confidence underfoot, and the triple jacquard knit upper delivers a luxurious, secure fit that works well for daily training and longer runs. The Brooks Glycerin GTS 23 is ideal for runners who want premium cushioning with subtle, reliable support that stays out of the way. Heel-Toe Offset: 8 mm