Inside them, he seems made of a more impermeable substance than most men, more compacted.

With the old ladder of mobility destroyed, England's class divisions would become more rigid, more impermeable, than ever.

They also ditched the silicone-based polymer that had been used previously in favor of a more impermeable material made of polystyrene-isoprene-styrene, or SIS.

Athletes turned their attention to flight suits and worked out that the more impermeable the clothing, the easier it would be stay in the air.