CHOKE FREE REFLECTIVE STEP IN ULTRA HARNESS - PURPLE - ALL SIZES - AMERICAN RIVER (Medium) by Doggie Design Trachea Safe - Choke Free Patented Design Pulls from the Chest ONLY Patented Conforming Shape Fit Seam Technology - Causes harness to conform to Dogs Chest curve. Patented Closure Slide Adjustibility - (Other copy cat harnesses have little or no size adjustment) Our 3 Inch Webbing allows for 3 Inches of Size Adjustment Safety - The Ultra is the perfect design for use as a Seat Belt Harness, PULLS from the Chest, not the Neck. Safe Night Walking Reflective strips. SIZE MEDIUM (Chest 16"-19")