Neoprene kinda compresses with continuous use so wear em often like while driving to work on a cold day and so on

Seriously perhaps try a bit of warm not boiling water to soften them up a bit and then hang them to dry with lead fishing weights in the fingers. That should lenthen them a bit, a better idea could be to see what happens when you stuff them with lead shot, like the lead in shotgun bullets. That could serve to lenthen and stretch them over the palms...
Good luck and lets us knows yes
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- Hénré -
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