This solid black harness by American River features high quality construction, a patented choke free design and a certified break strength to 386 pounds. The patented conforming shape fit seam technology causes the harness to conform to to the dog's chest curve thereby safely guarding the trachea from injury. There is also a patented slide adjustment allowing for the perfect fit. Other qualities include a double D-ring, reflective strips, zig zag stitched binding, touch fastener with a strong plastic side release buckle and a simple step in and go design. Comes in sizes XX-small to 3X-large. Features: Made of solid black soft mesh polyester Patented conforming shape fit seam technology - Causes harness to conform to dog's chest curve Choke free Trachea safe - Design pulls from the chest only Patented closure slide adjustability - 3-inch webbing allows for three inches of size adjustment Double D-Ring - Adds strength Reflective strips - For safer night walks Zig Zag stitch trim binding - Prevents missed stitches and creates a super-strong bond Double safety closure - Touch fastener and high strength plastic side-release buckle Simple step in, wrap up and go design Machine wash and line dry The design makes it perfect for use as a seat belt harness Certified Break Strength Tested to 386 Lbs., by an International Independent Testing Laboratory. US Patent Number US8418658 B1 Size Chest Pounds XX-Small 9"-11" 2-3 X-Small 11"-13" 4-6 Small 13"-16" 6-11 Medium 16"-19" 11-16 Large 19"-21" 16-25 X-Large 21"-24" 25-40 2X-Large 24"-27" 40-50 2X/3X-Large 27"-30" 50-60 3X-Large 30"-33" 60-90