3 ms·

Porosity. The metallic material is to cut down on air transfer.

• jxramos 9y ago
  I love being surprised, I would have never guessed that. Very cool. Porosity of bicycle inner tubes is an inconvenient problem for me and others, I don't suppose a metalic layer would work in that application however with the expansion and all. Cool to know though.
  • namibj 9y ago
    You could make it being crumpled and that way being flexible. The expansion is not that bad.