Klogs Shoe Size Chart:

If You Usually Wear Size 5 6 7 8 9 10 11 12 13 14
Women’s Narrow 5n 6n 7n 8n 9n 10n 11n 12n 13n 14n
Women’s Medium 5m 6m 7m 8m 9m 10m 11m 12m 13m 14m
Women’s Wide 5w 6w 7w 8w 9w 10w 11w 12w 13w 14w
Men’s Wide - 7w 8w 9w 10w 11w 12w 13w 14w 15w