Yes they are 100% waterproof.... think most pens work on them I use a power tank pen its 100% waterproof and comes off with any sort of alcohol (aftershave etc)
I've a spintso and the rft-100 both decent refs watches the spintso is a bit big the one I have is the one with the black buttons it's supposed to stop them rusting up, I've used it once lol
Rft-100 on one arm and polar on the another
Was in Arco today and got a pair of these insoles the mate works in there, and I got his discount (£28) have to say after using them for a few hours it sames like money well spent,
Only thing is it says to get a size smaller for football boots, I'm wanting to use them for my work and football...
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