Klogs Shoe Size Chart:

If You Usually Wear Size 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 12 13 14
Women’s Narrow 5n   6n   7n   8n   9n   10n   11n 12n 13n 14n
Women’s Medium 5m 5.5m 6m 6.5m 7m 7.5m 8m 8.5m 9m 9.5m 10m 10.5m 11m 12m 13m 14m
Women’s Wide 5w   6w 7w 7w 8w 8w 9w 9w 10w 10w 11w 11w 12w 13w 14w
Men’s Wide -   7w   8w   9w   10w   11w   12w 13w 14w 15w