Features: Made of soft red mesh polyester Ruffled neck, polka dot trim and bow accent American River: Polka Dot Collection 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