T'ai Chi shoes

Recently I spotted these shoes in Office, they are a bit dear £15-£20 depending on where you live, but Mary, Chris and others have pairs, and they say that they are really comfortable. Certainly they are better made than the usual type, and have a nice flexible rubber sole. Apparently cool kids are wearing them, and I have seen folks in them on the street, in the rain, which seemed highly impractical, but that's fashion for you. There are also other colours than black...