A = Back length. Measure the length from the withers to the ears.
B = Side length. Measure half way up the neck, the length from the mane to the bottom of the neck.

Order size
Top length (A) Side length (B)
L - - - - - -
M - - - - - -
S 90 cm 2'11" 35.4" 50 cm 1'7" 19.7"
Order size L
Top length (A) - Top length (A) - Top length (A) -
Side length (B) - Side length (B) - Side length (B) -
Order size M
Top length (A) - Top length (A) - Top length (A) -
Side length (B) - Side length (B) - Side length (B) -
Order size S
Top length (A) 90 cm Top length (A) 2'11" Top length (A) 35.4"
Side length (B) 50 cm Side length (B) 1'7" Side length (B) 19.7"

All sizes in the size chart are measured with the utmost care. The sizes may differ slightly from the actual product. You cannot derive any rights from this size chart.