These were rather a disappointment. The ones I received really don't fit anything larger than a men's size 10 regular shoe (forget even trying to use over a work boot at that size; they're tight on my women's size 8 hiking boots). They haven't worked well for any of the maintenance guys I've asked to wear them. They claim to be strong, but the ones I received rip rather easily. I'll use them for packing my shoes for travel, since it's not worth sending back.