Why You Chafe Worse After Hour Four
Why does chafing get so much worse in the back half of a long run? It's not bad luck — it's moisture physics and salt...
Field notes, protocols, and dispatches from the underground. Built for athletes who run long, ride hard, and refuse to stop because of friction.
The six-page field document for applying Friction Prescription right, plus 20% off your first order — auto-applied at checkout.
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