16” Black & Gray 1B/S Sew in Human Hair Extensions 100g Item#BS Natural Black with Silver Highlights Sew in human hair are used 100% remy human hair. Human hair extensions used double weft to keep thickness from top to end, no tangles. Sew in hair weft can be straightened, curled washed and restyled, just like your own hair. Note: Heating temperature shouldn’t exceed 180℃ to extend the life of the hair. Double Weft Sew in Weft Extensions. Real double weft extensions, sew in hair wefts are super soft to the touch and thick on the bottom. Multifunctional Wefts Hair Extensions Sew in. Remy human hair weave bundles can be sew in, clip in, glue in, micro beaded or use to make wig. Hair wefts are perfect to add length and volume without any discomfort. We recommend 1-2 packs to increase weight and 2-3 packs to increase length. Human hair weft extensions can be installed in multiple ways: sew in, micro link in, clip in, glue in, make wig or ponytails, support to create any hairstyles you prefer. One piece weft hair extensions human hair can be cut according to your needs, please care the incision needs to be sewn or glued, to avoid the hair at incision shedding.