STEP-IN DESIGN: No need to go over your dog’s head. Easy on – Easy off!DOUBLE SECURE: Special sheer velcro plus locking buckle to secure your dog. 360 DEGREE REFLECTIVE TRIM: For nighttime visibility. SHOCK ABSORPTION PANELS: Reduces strain on sensitive necks for aggressive pulling dogs. HYPER COOL MESH: Provides maximum air flow for cooling, comfort, and strength. QUICK DRY: Fast drying and machine washable. SIZE: Neck: 12-13 in, Chest: 15-17 in