XS

Pit to pit: 19".

Length of back: 24".

S

Pit to pit: 21".

Length of back: 26".

M

Pit to pit: 22".

Length of back: 28".

L

Pit to pit: 23".

Length of back: 28".

XL

Pit to pit: 24".

Length of back: 29".

XXL

Pit to pit: 25".

Length of back: 30".