The Irvin Vest Harness B 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" A harnesses, some people have found this harness to be more comfortable and easier to put on the dog. This harness features a diamond pattern and solid schemed. Matching leashes available and sold separately. Available in Mustard and Cream in sizes ranging from Small to X-Large.