This patriotic collar has a nice metal buckle and soft material on inside of collar for extra comfort.
XS measures 0.6 inches wide, and can be adjusted from 8 to 11 inches.
S measures 0.8 inches wide, and adjusts from 9 to 14 inches.
M measures 1 inch wide, and adjusts from 11 to 19 inches.
L also measure 1 inch wide, and adjust from 14 inches to 24 inches.