Silent steps, rapid pace! Run like a whisper through the night in the Brooks Glycerin Stealthfit GTS 21. Prioritizing underfoot comfort and a lightweight stride at high speeds, these silhouettes feature a nitrogen-infused DNA LOFT v3 and the innovative GuideRails holistic support technology to deliver a stride that feels too good to be true. The new RoadTack rubber matches your resilience with support, while the signature StealthFit design gives you the foundation you need to go the full distance. Lace up in the Brooks Glycerin Stealthfit GTS 21 and be like a phantom on the run. 2mm of DNA LOFT v3 underfoot offers even more plush cushioning. Stack height to 28:18 for a 10mm offset. Weight: 10 oz. *Designed for runners who need support to help keep excess joint movement in check.