this is the 'radler trail camp' shoe, from timberland. weighing only 255g, the key feature of these shoes are their ability to fold in half, and zip closed. the outside is water repellent, and the inside is fleece lined. the idea is that when you're not using it, you fold it up, and attach it with a carabiner to your bag.
at first i thought this looked great, before having doubts, but i think that actually for certain situations it would actually be quite useful. i'd like to get hold of a pair and give them a try on a canoeing/camping trip.
available from timberland, for $65.