No Pull Dog Harness: Whether you're working on training or need a day-to-day harness for handling your dog, our walking harness provides increased control while allowing your dog a full range of motion. Rain Defender: Rain or shine the no pull harness is constructed from 500-denier polyester with Rain Defender durable water repellent (DWR) technology repelling light rain and maintaining its form up to daily use no matter the conditions. Adjustability: The martingale chest strap provides your pets a no-pull function. The over-the-head outfitting, yoke style harness, fully-adjustable chest and belly strap paired with spacer mesh backing for breathability maintains adjustability and without compromising comfort. Low Light Visibility: Stitched with reflective low light stitching increasing low-light visibility, ensuring your pets safety and visibility in dimly light conditions. Sizing: Small (Chest Girth: 16"- 20") Medium (Chest Girth 21"- 28") Large (Chest Girth 26"- 35") Extra Large (Chest Girth 33"- 46") See sizing chart in images.