icansit

Great wooden highchair. Very attractive, built to last many, many years (like the Tripp Trapp and Svan), mostly easy to clean (just a couple of bits at the top of the legs where you can't really get into it without a toothpick or similar). Distributed in the UK by Mountain Buggy I believe. Optional tray, but pulls up to the table so you don't need one unless you want to feed away from it.

Stackable, should you happen to need more than one, but not foldable.

Quite expensive, but if you want something a bit different and don't mind paying for it, then this is the chair for you!