Toshi Sunhat fit and sizing is variable and dependent on several factors including stretch component and varying fabric construction. The following is an approximate sizing suggestion based on head circumference measurements.

XXS 37cm premmy - newborn
XS 43cm up to eight months
S 52cm eight months - two years
M 54cm two years - small grown-up
L 56cm big kid - grown up
XL 58cm bigger kids - bigger grown-ups