These are mainly used for horses that live in a stall or if you don't want your horse to get dirty right before a show. They are also used for older horses that might need an extra blanket in the wintertime.
This is what goes under your saddle. It protects your horses back from getting sores that the saddle could cause and it makes the horse more comfortable.
This is usually used when you are dragging something, it goes on the horse's chest. It helps the saddle not get pulled back out of position.
This usually has two pieces, one of the pieces is called the bit. It goes in the horse's mouth, and it helps control the horse. The headstall is the second part of the bridle, and it goes around the horse's head, it keeps the bit and place.
This helps the saddle stay on the horse, it usually goes under the horse's belly behind the front legs.
These connect to the bridle near the bit, and they are basically how you control your horse.