Here’s a rugged and protective iPhone case from Oakley. What might look like regular rubber is actually a mold of unobtainium® (the sure-grip mass Oakley normally use on their sunglasses to make sure they don’t fall off and yes, they’ve trademarked it).

While protecting your iPhone from daily abuse it sports an open face for the screen and full access to cord connections and controls. and a bargain at only £15 – $30 direct from Oakley  via:freshpilot