Dun'no, Gary. I had a great pair till I lost one glove a week ago. I don't see a whole lot of difference so I guess I'll go with the idea of replacing them when you wear hole in them, or the backs get so stretched out they get kind of floppy.
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Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.