Noise Reducing Bonnets
These bonnets are made with soft foam padding in the ears to reduce sound. They are not sound proof and the horse will still be able to hear you talk to them, as well as other noises, but they will soften and reduce loud noises that may cause them to become spooky.
The ears on these are quite long and may require adjusting, hence the low price. To adjust these simply turn the "ear" of the bonnet inside out, measure and mark the length of your horse's ear +1-2cm for room. Then resew along the curve to this mark, and cut off the excess.