PU Skin Weft Hair Extensions is also called as PU Skin weft or skin weft hair extensions or seamless wefts because they are invisible without seams and blend in to match your scalp. Skin Wefts are similar to tape-in hair extensions but they are 15 inches in length and made of a realistic polyurethane base.pu skin weft hair extensions can be attached and removed easily. A Tape or Adhesive Skin Weft hair extension is a hairpiece made from human hair, and can be attached to the wearer's scalp by a specialized tape system.Skin weft extension is the ultimate hair accessory for achieving the most natural looking and undetectable weave.Silanda hair extensions are great for seamlessly lengthening and/or thickening short and/or thin hair.