Features: Easy Access Leash Hole Velcro Fastener at Collar and Center Body Reflective Strip Lightweight Warmth Size Guide: X-Small: Body Length: 8"-10" Chest: 13"-16" Weight: 7-12lbs Small: Body Length: 10"-12" Chest: 15"-19" Weight: 12-25lbs Medium: Body Length: 14"-16" Chest: 19"-26" Weight: 25-40lbs Large: Body Length: 18"-20" Chest: 22"-31" Weight: 40-70lbs X-Large: Body Length: 22"-24" Chest: 27"-36"