At first glance, kinetic sand looks a lot like plain old wet sand—but all those grains are actually coated with silicone oil rather than water. That silicone oil is called dimethicone, and it’s a common ingredient in hand lotion because it repels water. If you could zoom in on dimethicone’s molecular structure, you’d see long chains—and those long chains give it a honey-like quality. In practice, that means you can mold a solid object that will slowly flow out of the solid form like a super-satisfying viscous liquid. And remember how dimethicone repels water? That’s great for kinetic sand since the sand will stick to itself but not to other things, making for quick and easy cleanup. Now that you know how it works, here’s how to pick the kit for you and your kids.