Sole rot in polyerethane soles of shoes is such a problem that Blundstone now document it on the tags on their shoes.
"Hydrolysis (derterioration through moisture) can occur when PU is stored or used in warm climatic conditions. Stock should be rotated regularly and, if stocked for a extended period, should be stored in air conditiond premises
Faliure to observe these precautions can lead to premature deterioration. The date of manufacture in marked on the end of the box."
One northern australian wet season was enough to do this, i.e. swapped the blunnies for the wellies for a couple of months
Now my daily is a pair of Oliver lace ups for the ankle support, they are slip-ons when I forget the laces