look like jellyfish legs, also polyurethane.

And then another pair of legs we collaborated on were these look like jellyfish legs, also polyurethane.

They are most frequently made of latex, and can also be made out of synthetic materials including polyurethane.

So we made what people lovingly referred to as glass legs even though they're actually optically clear polyurethane, a.k.a. bowling ball material.

And here's the simplest version in nature, and here's my collaborator Ron Fearing's attempt at an artificial version of this dry adhesive made from polyurethane.