IKEA basic underlay. I've tried loads and honestly think this is one of the best for hard floors, especially considering the price. Not too spongey, doesn't move around, not too sticky. I bought this off an eBay seller and started to open the packet, so I can't return it. I thought I was buying the larger size, but this is just 70x140cm! save yourself a trip to IKEA and buy here! thanks for looking
eBay