Question: are ultra boost 19 true to size?
Answer: That fit was achieved through the sock-like comfort of the Primeknit-laden upper and the highly breathable perforated mesh of the tongue. How to pick your size: Ultraboost 1.0 (OG) sizing is TTS (true to size), so for most people their measured size is the way to go. For wider feet, go a half size up.