OK - for @scrambler who may also like to know about this... I ordered these from the UK and it came in about a week by airmail (I ordered direct from Bloccs website as boots were out of stock).
Just tried it this morning for a swim (yes, really!) and a shower. Fabulous. If you are a big guy, you may find this cuts off your circulation and is painful - it was borderline for me but I do have fairly chubby legs. But great for some freedom in the pool.