A cast is a rigid dressing that is used to immobilize an injured body part, as in a fracture or dislocation. There are two major types of cast materials. They include:
* plaster, and
* fiberglass.

Plaster is the traditional cast material. It is inexpensive and easy to use, but can be fragile. It can disintegrate if it gets wet. It may become weak, and require additional applications if it starts to fall apart.

Fiberglass casts are made of synthetic material, which is more expensive than plaster casting material. However, fiberglass casts are stronger and lighter than other casts. They tend to dry quickly, and can get wet. If they get wet, they do not fall apart. They are also available in multiple colors, which can be an advantage for young children.

If your provider recommends a fiberglass cast, make sure that you dry it if it gets wet. If you don't, you may develop a rash or infection under the cast. However, even though you can get it wet, you should not submerge the cast. You do not go swimming or bathe while wearing a fiberglass cast. This is too much water for the cast, and may damage the cast. A damaged cast may not be able to support or stabilize your injury.

Make sure your healthcare provider gives you specific information on cast care after your cast is placed. Most casts are removed within two to six weeks of application, though some may need to be on longer.

Regardless of the type of cast used, it is important to notify your doctor if you experience the following symptoms:
* increasing pain,
* increasing swelling,
* numbness, tingling or a "pins and needles" sensation,
* a cool, cold or discolored extremity,
* a foul odor coming from the casted area.

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