Casual Canine® Mesh Dog Harnesses are lightweight, comfortable and breathable. Mesh dog harnesses have adjustable chest straps, quick-release plastic buckles, and nickel-plated D-rings for a secure fit. Remarkable quality at an unbelievable price! Lightweight, breathable mesh dog harnesses have an adjustable chest strap for an easy fit. Features a quick-release plastic buckle, and a nickel-plated D-ring for leash attachment. X-Small Harness fits chests 11" to 13", Small Harness fits chests 12" to 17", Medium Harness fits chests 16" to 22", Large Harness fits chests 19" to 26".