['Fusion or Bonded Hair Extensions. Best for: Medium to thick hair. ... ', 'Tape-In Hair Extensions. Best for: Fine, thin hair. ... ', 'Weave or Sew-In Extensions. Best for: Coarse, curly, or thick hair. ... ', 'Micro-bead/Micro-Ring Hair Extensions. Best for: Medium to thick hair. ... ', 'Clip-in Extensions. Best for: Medium density hair.']