Sleek styling. Flexible FeelTrue sole for natural power transfer. Lightweight construction (7.6 oz. M9) for efficiency and speed. Superior comfort with an anatomically-correct wide toe box, adjustable instep straps, and non-elevated "Xero-drop" sole. Low-to-the-ground (9mm stack height) for balance and agility. Prio  the wheels for your engine.

following these instructions, if you think you are between sizes, go up a 1/2 size