Inexpensive hair extensions may be sensitive to heat and could burn if you use a hot curling iron, flat iron, or hot rollers. High-quality extensions, such as those made from monofiber or thermofiber, can withstand more heat but may cost more. . Most synthetic hair extensions are straight. Curling Synthetic Hair With a Curling Iron. Determine if you can curl the hair. If you're using synthetic hair extensions or a wig, read the product label to see if it can be heated. The label should tell you how much heat the synthetic hair can handle. You can heat style your remy hair extensions just as you do with your natural hair, and blow-dry, curl and straighten them, but keep in mind human hair . Synthetic hair extensions can add width and length to your hairstyle. These extensions also give you plenty of options when it comes to styling your hair. Just as . Jun 19, 2018 - Here we will share you 5 easy ways to curl your hair extensions. Before curling the hair extension, you must ensure that your wearing hair . Jul 1, 2016 - You can curl your extensions while they're in your hair, but I find curling them separately makes it easy to get perfect curls in each hair type. Jan 18, 2018 - You would just be spending money on something that you can do yourself. All the techniques that hair professionals use to curl your locks are . If you have purchased a set of straight 100% human remy hair extensions, but have noticed that they do not hold a curl very well, you may be left wondering why .