Hair extensions are strands or braids of synthetic or real hair that can be woven into your own hair to give it fullness, body, curl and color. There are a number of hair extension types, which include braids and dreadlocks, strands, and wefts. Extensions are made from either synthetic (usually plastic) materials or real human hair. Whether you can dye or perm the extension depends on the type of hair. For example, dark, coarse hair extensions usually can't be color treated. Some hair extensions come already color treated. You can buy hair that is pre-colored, pre-highlighted and pre-permed with curl or body wave.
Depending on which type of hair extension that you purchase, the application of the extension into your own hair will differ. If you bought braids, than they are usually woven into your natural hair. If you bought strands, they're often woven, glued or clipped into your natural hair. If you bought wefts they're usually attatched by first braiding small horizontal rows of your own hair close to your scalp and then sewing the weft extensions into the braid.
Hair extensions can come in all different sizes up to around 30 inches long. Althought most buy their extensions at around 18 inches long. Besides the actual cost of the hair, you may pay to have the hair treated, and you may pay to have the hair attached by a professional. Beyond that, there is upkeep. This could include having your hair rebraided every 6-8 weeks so the wefts can be reattached, or having the strand extensions treated or removed by a hair dresser. So the pricing can vary greatly.