Men Women Junior Children
  Circumference Length Circumference Length Circumference Length Circumference Length
XXS             3" (age 1) 3.75" (age 1)
XS         4" (age 6) 5.5" (age 6) 3.5" (age 2) 4" (age 2)
S 7.5" - 8" 7.5" 6.5" 6.5" 4.5" (age 7) 5.75" (age 7) 4" (age 3) 4.25" (age 3)
M 8.5"  7.75" 7" 7" 5" (age 8-9) 6" (age 8-9) 4.5" (age 3-4) 4.5" (age 3-4)
L 9-9.5" 8" 7.5" 7.5" 5.5" (age 10-11) 6.25" (age 10-11) 5" (age 4-5) 4" (age 4-5)
XL 10-10.5" 8.5"     6" (age 12-13 6.5" (age 12-13) 5.5" (age 5) 6.5 (age 5)
XXL 11-12" 9"            

Hand Circumference: Flat, from crook of thumb around outer edge of palm.
Hand Length: Figertip to the bottom of the palm.

Sizing will vary slightly from style to style based on insulation levels.