The Theros Vest Harness is a step-in harness, with a backside hook and loop closure and quick release buckle. Though the chest size is not adjustable like the "over the head" type A harnesses, some people have found this harness to be more comfortable and easier to put on the dog. This fashionable all season harness features a Striped pattern and solid schemed. Matching leashes available and sold separately. Available in Pink and Aqua in sizes ranging from Small to X-Large. Note: Unlike human clothes, pet apparel designers have different sizing characteristics. Please do not purchase a Puppia harness based on the size of another manufactuerers/designers.