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StealthFit means the upper disappears around your foot, and that's exactly the point here. A flat-knit construction wraps snug without a single hot spot, while DNA LOFT v3 cushioning underneath delivers the plush, long-mile comfort the Glycerin name is known for. A broad platform keeps heel-to-toe transitions smooth across whatever distance you're logging.
What does "StealthFit" mean on the Glycerin StealthFit 21? It refers to the updated flat-knit upper construction — the Brooks Glycerin StealthFit 21 uses it for a snugger, sock-like fit compared to a standard engineered mesh upper.
