slip Reusable Face Covering in Black. slip Reusable Face Covering in Black. slip's reusable Face Covers are made from 100% highest grade mulberry silk on both sides with non-toxic dyes and a 100% cotton inner layer, designed to be gentle on your delicate facial skin. Please note: The slip reusable Face Cover is neither a medical device nor personal protective equipment (PPE). It should not be used by healthcare professionals, in healthcare/clinical environments or settings, or when the use of a medical device or PPE is required. It is not designed to prevent or protect from any form of risks to a person's health or safety, illness or disease (or otherwise). It does not cause damages to, nor bring additional risks for users according to its intended use.. Not a medical grade face mask. Please consult with your local health authority for guidance on use of non-medical grade face masks. Adjustable elastic earloops and nose wire. Includes 10 spare nose wires and 2 sets of silicone stoppers. Top and bottom width measures approx 11Center front length measures approx 3.25. Cover your mouth and nose with the face covering - it should fit snugly but comfortably against the side of the face. Adjust the ear loops and nose wire as needed. Wash after each use. Do not use this face-covering on young children under age 2 or any person who has trouble breathing, is unconscious, incapacitated or otherwise unable to remove the face cover without assistance. SLIP-WU20. 810046980385. In 2003, slip Co-Founder and CEO Fiona Stewart was prescribed acne medication which resulted in extremely sensitive skin and thinning hair. Her dermatologist suggested sleeping on a silk pillowcase. Unable to find one, she sourced the best silk she could find and wrapped it around her pillow. The results were dramatic and immediate, she's never looked back. She had stumbled upon a long-forgotten beauty secret - and slip was born.