Spigen Slim Armor
Spigen is an extremely popular option for all smartphones, especially the Nexus 5. The company's Slim Armor is our favorite option for the dual layer protection. A custom fit TPU protective case absorbs shock on all sides in case the device is dropped, but it also has another layer for ultimate protection. The Slim Armor is thinner in the middle back, and a lightweight but durable (and form fitting) polycarbonate shell snaps into place. This gives you a better grip, more durability, and can be changed out with gold, black, or white. The power button is covered and can be quite sensitive at times.
$24.99 from Spigen