[DonVoigt]

Hugh,
the chemicals in the foam start to degrade as soon as they are formed, especially if they are cheaply done. The by products of "decay" are what cause the damage.

Thick socks will help, so will frequent in and out to allow volatile chemicals to escape.

I would still not "store" them in the case, carry them around in it yes- but in socks.

IMO the "best" method of carefree storage is "unwrapped" in a safe with drier in place and the safe in a climate controlled environment. Pistols oiled and wiped down as usual, no heavy grease or other extra ordinary steps required.