Pretty darn grippy! The KOALA was designed using a matte silicone that helps give it traction against your phone. The KOALA will still hold tight as long as at least three of the 4 loops stay over the corners of your device should any mishaps happen in your adventures.
However, if you find a rebellious corner, it is always a good idea to stretch your KOALA back into shape to keep your smartphone safe and secure at all 4 contact points.