small= 16 inches pit to pit and 25 inches top to bottom
medium=17 inches pit to pit and 26 1/4 inches top to bottom
large=18 1/2 inches pit to pit and 27 inches top to bottom
xl=19 1/2 inches pit to pit and 28 inches top to bottom
2x=22 inches pit to pit and 28 1/2 inches top to bottom