Hi! I did have a waterproof mattress cover on my sons bed, but with all his wriggling about the waterproof top has peeled away. Any way I am in the position where I need to change it and am currently contemplating buying the Hippy Chick cotton protectors, and am wondering has anyone any experience of these? They appear on the adverts to lie over the top of the sheet, but doesn't get tucked in. Surely this would move under a wriggly wee boy and end up being of no use! I don't particularly like the plastic/pvc waterproof covers as they are very sweaty! Any advice will be most welcome! Ta