It's a 3' by 3' neoprene gaming mat, specifically designed for the game, including all of the markings ready to go. It rolls nicely into the carry case that comes with it, and will set you back £35, with free UK postage (or £10 for EU and £15 for ROW). It has a target of £1000, and is at 60% at the time of writing this (less than an hour after the start of the campaign).
The campaign finishes on April 19th.