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The point of a hair weave is to slip into whatever styles you wish without consequence to your natural locks, but weave hair does have its limitations. Some types of weave hair can't be changed from straight to curly and back, while others are easily curled and stay that way throughout the day. Choose the right type of weave hair if you are looking for a cute and curly option for your faux locks.
If you want a weave that you can manipulate between straight and curly, pinned up or left loose, then human hair is your best bet. Some human hair for weaves is made up of both human and synthetic locks, but to get your weave to hold the curls you add to it with a curling iron or flat iron, you need 100 percent human hair. This hair is just as easy to manipulate as your natural locks and will hold a curl for roughly the same length of time that a head full of natural hair will.
If you've got extensions that you can easily take on and off (versus the variety that is, say, sewn or glued in), then synthetic hair will hold a curl easily -- provided you add the curl the right way. To get synthetic hair to hold a curl, you need to wrap the hair around rods and dip them into a bowl of boiling water. After allowing the hair to sit in the super hot water for about two hours, unravel the hair from the rods, and you have instant curls. When you use this method, the synthetic hair holds the curl for a week or two.
Hot curlers or rods will result in large and loopy curls that hold for longer than the curl created from the temporary heat of a curling iron. This means that when using a flat or curling iron to curl human hair, expect the curls to begin to fall after an hour or two, faster if the hair is exposed to any moisture (even the humidity in the air). Rods are the only way to add curl to synthetic hair, as the curl created from a flat or curling iron won't hold at all.
If you want to retain the ability to manipulate hair, then consult with your stylist on weave hair brands. More pricey brands will behave better than cheaply made extensions. Also, other factors might affect the weave's ability to hold the curl. Too much product on the hair can weigh hair down and make brushing and curling it impossible.