Features: Reflective Trim Water Resistant Easy Access Leash Hole Velcro Fastener Lightweight Warmth Size Guide: X-Small: Body Length: 8" Chest: 10"-18" Weight: 5-11 lbs Small: Body Length: 10-12" Chest: 17"-23" Weight: 10-26 lbs Medium: Body Length: 14"-16" Chest: 22"-27" Weight: 25-41 lbs Large: Body Length: 18"-20" Chest: 26" - 33" Weight: 40-71 lbs X-Large: Body Length: 22"-24" Chest: 32"-39" Weight: 70-110 lbs