When sizing for wading boots, typically we like to start one size up from your normal shoe size. This is to accommodate for the added volume needed when wearing waders.
The chart below lists the ORVIS Wading Boot sizing with equivalent shoe sizes. Please use this chart when ordering to ensure an ideal fit. (i.e. Men's US size 10 would take an ORVIS Men's Wading Boot size 11/Women's US size 7 would take an ORVIS Women's Wading Boot size 8.)