For us ladies only light as a feather comfortable and natural eyelash extensions are available in various curls lengths and thicknesses individual eyelash extensions are semi permanent and can last up to 8 12 weeks depending on your natural lash growth cycle to keep your lashes at their very best i recommend infill maintenance every 2 3 weeks as a belle hair extensions training academy trained technician i offer expert application avoiding the use of oil based eye products will help