FLIGHTboot sizing is approximate and is based on the fit over running shoes. These very snug, performance-fitting overboots work best with a low-top running shoe. If you plan on using an aggressive, lugged, trail shoe — and you are on the cusp of the sizing chart — please order the next size up. Likewise, if you must use a hiking boot with the FLIGHTboot — and you are on the cusp on the sizing chart — please order the next size up.

XXS: youth 1–4
XS: youth 4.5–6
S: women's 7.5–9
M: men's 8–9
L: men's 9.5–10.5
XL: men's 11–12
XXL: men's 12.5–14