Kinetic Sand, by Waba Fun, is an amazing toy that is hard to describe. The sand is mixed with silicone-like polydimethylsiloxane (what?!?), which makes the granules stick together. This turns the 1 kilogram package of sand into a flow-able, mound-able, mold-able substance that has a very unique and soft texture. It is like nothing you have ever felt before.
Like we said, it is really hard to describe so the best way to show it off is with a video:
While it cleans up easily, we suggest playing with the sand on the kitchen table, well away from carpet and soft furniture. It isn't toxic, but we don't think it is appropriate for young children who still put things in their mouth. However, for a child (or adult) who likes to sculpt, mold, and build, this is an amazing toy that will provide hours of fun.