Horse Bridle Biothane English Bridle With Reins Size Available : Full, cob ,Pony Color : Red , Blue , Yellow , Black Material : Biothane Biothane bridle tack is used mainly by trail and endurance riders for a variety of reasons. Biothane, a plastic strapping which is a polyurethane-coated nylon strap, is durable and made to resist fading. Biothane does not tear, fray or soak up moisture the way woven material or leather can.