Comes in Sizes S-XXXL.  Recommended to order one size bigger for a comfortable fit as they run fitted.  

Approximate Dimensions of each size (in inches): 
XS : 14.5" wide x 8.5" tall
S: 15.5" wide x 9" tall
M: 16" wide x 9.5" tall
L: 17" wide x 9.5" tall
XL: 18" wide x 10" tall
XXL: 18.5" wide x 10.5" tall
XXXL: 19.5" wide x 11" tall