Targets for crossbows

[wagonwx]

I've just bought myself a crossbow and need a target that will successfully stop the bolts. I use to do a bit of archery years ago and still have an old straw target, but from what I gather the bolts will go clean through it without much difficulty at all. Anyone any information on foam targets, how good they are and how dense they'll need to be to stop a crossbow bolt. The bags you put clothes and rags in etc look a bit shit imo, I'd prefer a proper stand up target.