There are a few cases around for the wide Garmin sat navs, and from reading reviews I think there has been some confusion about the products.
This case is leather with a sleeve that folds over to close it. There are two magnets concealed in the leather to hold the sleeve shut - a definite plus. There are others available which are plastic, and don't have anything to hold them closed, or are open ended. Seems to be the main gripes about the others.
I have the Garmin 255wt and the case is slightly too large - not a snug fit (another problem with the plastic cases). However, as the magnets hold it shut this isn't a problem, plus the case arrived with 2 foam pieces inside to hold the shape. The small piece can be left in behind the sat nav to fill the gap, so not visible and stops any movement.
I am pleased to have bought this one, as only marginally more (a few pence), and sat nav can't fall out.