Silk is water based personal lubricant, and is Sliquid's Hybrid formulation. Starting with a super silky water base, and blended with 12% silicone, Sliquid Silk is all that a water based personal lubricant can be, with the added longevity of a silicone lubricant. As always, Sliquid Silk is glycerin and paraben free, and is perfect for couples or for solo use. Silk is easy to clean up and has a luxurious creamy texture. All Sliquid products are formulated by sensitive women, for sensible women, and will never cause yeast infections or UTI's.