Hi Bruce - I've had both, and they were both good. My understanding is that they used to use event, but changed to their own proprietary brand. They are both very efficient, only losing effectiveness when the tops get strongly creased after lots of use, or when the soles develop cracks (funny that!

)
I love Keens for everyday walking and day walks, though I wouldn't use them for big trips. However I have friends, incl. my wife

who use them for their main walking. They love their light weight and quick drying properties, even if they're not as hard-wearing as leather boots.
cheers
Peter