These luxurious ponytail holders protect delicate hair from the damaging tugging caused by traditional hair ties. Its wide surface area and high-grade silk fabrication reduces ridges and promotes soft, healthy locks. About Slip In 2003, Fiona Stewart was prescribed acne medication that resulted in extremely sensitive skin and thinning hair. Her dermatologist suggested that she sleep on a silk pillowcase. Unable to find one, Stewart sourced the best silk she could find and wrapped it around her pillow - the improvements to the health and radiance of both her hair and skin were so dramatic, she never looked back. The following year, Stewart and her partner Justin Dubois officially launched SLIP: the first silk pillowcase to be branded and marketed as a beauty product. Developed and refined for over ten years, the brand's signature slipsilk provides the ultimate combination of shine, thickness, softness, and durability for their line of pillowcases, sleep masks, and more.