Silk eyelashes, unlike the names implies, are not made from silk. They're actually made from synthetic silk that is shaped into perfectly curled lashes. They're thicker at the bottom and thinner at the top, and are made to look natural and full. With these types of synthetic lashes, you can sleep with them on, swim, sunbathe and play sports. The lashes require very little maintenance and allow you to continue with your daily activities without worrying about them falling out. Lashes done by a professional can last anything from 3-6 weeks, depending on the life cycle of you lashes. For a great look, you'll need to have 40-50 lashes added.