I'll tell ya what I did....
...After seeing and hearing some bad stories about korkers....
...for example, losing spikes....and having them loosen up on your feet....and losing them in the surf, or rocks.....when the straps break.
....so what I did, and which was cost effective...
....I purchased some felt soles with spikes in them....I brought them to a local cobbler and had him attach them to my waders....
....Haven't been sorry yet....AWESOME!!!.....