The Princeton is a great looking Flat Cap made in the USA. Constructed of luxurious, buttery soft, Napa lambskin leather it features a moisture wicking sweatband and full satin lining.
Approximate sizing is:
S - 6 3/4 to 6 7/8
M - 7 to 7 1/8
L - 7 1/4 to 7 3/8
XL - 7 1/2 to 7 5/8
The closer you are to the upper limit the better the fit.
Foam sizing tape is sent with each hat to help snug it up if necessary.