Shrinking flabby brifter hoods?

in Workshop
My rhs shimano 6800 brifter hood has started to go a bit 'flabby'. Is there a way to shrink it back to size? I thought about putting it in the freezer but I think I read somewhere that has the opposite effect. Has anyone managed to do this?
TIA
TIA
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https://www.sjscycles.co.uk/brake-levers/shimano-ultegra-st6800-bracket-covers-black-y00e98080/