The Harness Breastplate & Adapter Add-On is easy to attach and remove from various Ray Allen harnesses. The modular component can be used on the TH-4 Kinetic Duty Harness, 36MHU Ultimate Harness, 36MHM Opportunity Harness, RA36MHE Extreme Harness, RA36S Assist Harness and the 36MHL Modular LLC Harness all of which can be purchased from this website. The triangular breastplate pad features a 4" VELCRO pad exterior with a mesh inner lining that provides additional padding but also allows for cooling airflow. The center strap goes down the chest through the legs and under the belly, quickly converting a two-strap harness into a more secure three-strap harness similar to those used for agitation and heavy pulling. Harness is sold separately.