The Equine Comfort Products ear plugs are made of 100% Australian merino sheepskin, the top quality sheepskin around. These light weight ear plugs are hypoallergenic and very soft for the ear. Ear plugs are used to maintain your horse calm during situations that can be stressful to them. Horses have an acute sense of hearing, ranging from very high frequencies to very low, sometime barely audible by humans. In certain circumstances when their hearing senses are triggered, horses will run away, spook or simply be afraid, leading to unpredictable results. The typical applications are for grooming, eventing, training, exposure to new surroundings, high traffic barns, riding near paved roads, parades or any kind of noisy environment that could be perceived as a threat by your horse. Care instructions: Machine wash in cold water or gentle cycle. The use of regular laundry detergent will cause the sheepskin to deteriorate. Dry in shade, not in direct sunlight or any direct heat source.