SnoClops riding that rail.

Size guide

  XS S M L XL
Width (inches) 15 ⅜ 16 ⅛ 16 ⅞ 18 ⅛ 19 ¼
Body Length (inches) 17 ⅜ 18 ⅞ 20 ½ 22 ½ 24 ⅜
Sleeve Length (inches) 14 ⅝ 15 ¾ 16 ⅞ 18 ½ 20 ⅛