Yes, this is a 'safe for work' thread. I've had an ass-saver sitting in my garage for ages. It's basically a strip of rigid plastic with some folds in it so it can store under your saddle, and be flipped out when needed. It's by no means intended as a 'mudguard', but to keep the worst of the road grime off you in an emergency.
Given I'm on the cross bike (while awaiting new tyres for the Kaff (as well as re-centring the rear wheel and sorting the brakes)), and it's wet, the ass-saver has finally been deployed.
As Roibeard pointed out at PY last Friday, it looks ridiculous. But hey, if it's effective.... Which it isn't really. Okay, so on a mildly wet surface, or a little patch of a metre or so of grime, it'll catch 'some' muck. But anything more. This morning, for example... The problem is added to by the fact that it appears once it has been folded and unfloded a few times it loses a bit of rigidity. It's floppier than an octogenarian who has forgotten to take his viagra. Which means the coverage is even worse than before.
Roll on the weekend and Kaff fettling. Can't believe I commuted for a good couple of years without any mudguards....