If you've tried both, you'll know that sheet masks tend to operate more vigorously than their overnight counterparts, whilst sleeping masks have a more progressive impact and are better able to lock moisture into the skin because they're supposed to be left on for a much longer period of time. However, this advantage can't be exploited without removing the mask after it has done its job. This is where they differ from facials which are all-encompassing treatments designed to improve the overall health of the skin. Sheet masks are simple to use and don't require any special equipment so if you need to get dressed up but want to give your skin a similar experience to an in-person facial, these are the way to go. They can be made from a wide variety of materials, but cotton is by far the most popular choice. The key thing to note here is how tightly the fabric is woven; the finer the thread, the better. This will determine how effective the mask will be at delivering ingredients into the skin. In addition to this, some fabrics have additional benefits such as reducing heat loss or blocking out harmful UV rays. For example, silk has many properties that make it suitable for use in medical products including being antibacterial and absorbing excess fluid from the skin. Silk is not only beautiful but also expensive so using it for personal care products is not recommended unless you can afford high quality items.