Small sections of your own hair, are sandwiched between two segments of extensions, these cannot be lifted, so they have to be taken out and reinstalled every time.
Individual pieces attached with a bead, that can be lifted every 4-6 weeks.
Keratin tipped individual strands fused to the hair with heat. These cannot be lifted but can last up to 4 months.
Sewn In Wefts
The wefts are sewn into bead tracks (not braids), and can be lifted.