I usually get 6-7 years from a pair of slippers. The soles of these Evan slippers wore out over 1.5 winters of breakfast and late-night trips to the bathroom over carpet and vinyl floors. Revain's description says "leather soles" while the tag says "PVC soles" (see screenshot). Look closely at the worn edges in the second photo and you will see that there is thin plastic on the fabric.
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