In reply to The Bouldering Badger: Its something like 1m x 1m, most other mats seems to be roughly the same size really, think the biggest is made by SNAP at around 120cm x 110cm?
Its a nice size to be fair though, decent & very firm foam, although i imagine with use it may soften a little, the bottoms not rubberized but team it up with a scrap of tarp and you'll have enough of a dry area and mat for most problems, wouldn't use it on its own for highball stuff but wouldn't use just one pad for that kind of thing anyway.
All in all at that price its a steal, if you decide afterwards you'd like something a bit more fancy it'll make a great second mat.