In addition to "proofs" specified above above, these condoms are sweatproof, snowproof, rainproof and mudproof. And best of all, these skins can be used as a regular condom, since "the latex used is seventeen times stronger than regular latex and can be stretched seven times its own length."

You put the skin under your cellphone like a regular condom, roll it up, tie it off, roll it back over, and pull it until it's nice and tight. Similar to a regular condom, except with a few more rolls. We don't know about you, but we get blood, paint and mud on our condoms all the time. – Jason Chen

Product Page [Skins Mobile via The Register]