Equi-Prene Pressure Eze Girths are designed to reduce pressure on the ascending pectorials which helps prevent injury and aids in breathing. The Pectorial muscles run from the breastbone to the fore-arm and bring the leg inward. The pressure caused by girths, restricts the use of this muscle and limits the front end movement. By doubling the surface area over this muscle, we halve the pressure. The dual elastic ends also aid in pressure relief as well as helping with the vital function of breathing.