As the name suggests, the Zilco Underhalter has been designed to be worn underneath a driving bridle. It is discreet and lightweight so that it does not interfere with the functionality of the bridle. Some competitions require halters to be worn with a driving bridle for safety reasons, and this model meets these requirements without adding weight or bulk. Made from synthetic material, this model is black for a discreet appearance. There is a PP webbing modeal also available in a range of colours to coordinate with preferred colour schemes.