II. Read the text and define the main idea of it: Horse Tack: Bridles and Breastplates

Bridles, hackamores, halters or headcollars, and similar equipment consist of various arrangements of straps around the horse's head, and are used for control and communication with the animal.

A halter (US) or headcollar (BE) (occasionally headstall) consists of a noseband and headstall that buckles around the horse's head and allows the horse to be led or tied. The lead rope is separate, and it may be short (from six to ten feet, two to three meters) for everyday leading and tying, or much longer (up to 25 feet, eight meters) for tasks such as for leading packhorses or for picketing a horse out to graze. Some horses, particularly stallions, may have a chain attached to the lead rope and placed over the nose or under the jaw to increase the control provided by a halter while being led. Most of the time, horses are not ridden with a halter, as it offers insufficient precision and control. Halters have no bit.

In Australian and British English, a halter is a rope with a spliced running loop around the nose and another over the poll, used mainly for unbroken horses or for cattle. The lead rope cannot be removed from the halter. A show halter is made from rolled leather and the lead attaches to form the chinpiece of the noseband. These halters are not suitable for paddock usage or in loose stalls. An underhalter is a lightweight halter or headcollar which is made with only one small buckle, and can be worn under a bridle for tethering a horse without untacking.

Bridles usually have a 'bit attached to reins and are used for riding and driving horses.

English Bridles have a cavesson style noseband and are seen in English riding. Their reins are buckled to one another, and they have little adornment or flashy hardware.

Western Bridles used in Western riding usually have no noseband, are made of thin bridle leather. They may have long, separated "Split" reins or shorter closed reins. Western bridles are often adorned with silver or other decorative features.

Double bridles are a type of English bridle that use two bits in the mouth at once, a snaffle and a curb. The two bits allow the rider to have very precise control of the horse. As a rule, only very advanced horses and riders use double bridles. Double bridles are usually seen in the top levels of dressage, but also are seen in certain types of show hack and saddle seat competition.

Breastplates, breastcollars or breastgirths attach to the front of the saddle, cross the horse's chest, and usually have a strap that runs between the horse's front legs and attaches to the girth. They keep the saddle from sliding back or sideways. They are usually seen in demanding, fast-paced sports. They are crucial pieces of safety equipment for English riding activities requiring jumping, such events as show jumping, polo, and fox hunting. They are also seen in Western riding events, particularly in rodeo, reining and cutting, where it is particularly important to prevent a saddle from shifting. They may also be worn in other horse show classes for decorative purposes.