Case-Mate Naked Tough
Considering the HTC One M8 is one of the best designed smartphones around with a beautiful brushed aluminum design, many owners won't want to cover it, but still want protection. The Case-Mate Naked Tough is a durable yet clear two-ply hard shell plastic case that shows off the design but is still extremely strong. It's slim, sleek, and has all the cutouts for access to every feature of the phone. Don't cover up that aluminum, but keep it safe.
$35 from Case-Mate