Nikki Smith Hair Collection Tape-in hair extensions are a popular method of adding length and volume to natural hair. They consist of small, pre-taped wefts of hair that are applied to the scalp using a special adhesive. Tape-ins are applied in sections, with the wefts being sandwiched between layers of natural hair. They are easy to apply and remove, and can be worn for up to 8 weeks with proper care and maintenance. Tape-in extensions are a great option for those looking for a semi-permanent solution for adding length and volume to their hair.