Keep them out of the sun and in a cool area.
Do not fold them over, it weakens the boots at the fold area; so leave them stretched out fully. I hang mine in the basement, legs hanging down.
I hang mine upside down and leave them in a cool place out of the sun as well. Once they dry out from the sun they will crack also leaving them folded over will crack them and they will leak as Lablover stated.
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