These run very small.  If you are on a long hike they will fall off your boot, it happened to my brother.  My brother and I bought these in 2010.  I  will not use these on hikes, but still use them for shoveling snow.  I noticed today that the rubber is staring to degrade.  One of the straps will be snapping apart soon...see photo.  Other then that they have good traction on the ice.