Small Cap: 

Circumference 21 - 21.5”
Front to Nape 13 – 13.5”
Ear to Ear Across Forehead 11”

Medium Cap: 
*Popular choice*

Circumference 22 - 22.5”
Front to Nape 14 – 14.5”
Ear to Ear Across Forehead 12 – 12.5”

Large Cap:

Circumference 23 - 23.5”
Front to Nape 15 – 15.5”
Ear to Ear Across Forehead 11.5 – 12”