What do you mean by "100% Waterproof"?

1.) Independent testing:

In 1999 we commissioned the British Standards Institution (BSi) to conduct a series of tests on our Aquaclip sealing system against the requirements of BS EN 60529:1992 [Note: The 'TC' clip used on the Radio Microphone and Connected Electronics cases had not yet been invented and was not therefore tested by BSi] The first tests were for the degree of protection against 'ingress of solid objects'. In layman's terms they were testing to see if it was possible to blow or suck dust through a sealed Aquaclip. The answer was no. All the samples passed IP6X Category 1, the toughest test there is. Next they were tested for waterproof ness. All complied with IPX7 which covers temporary immersion. Then they were tested to the most demanding standard of all - IPX8 - meaning 30 minutes continuous immersion at a depth of 10 meters = 33 feet. Most passed this test too. In fact the smallest Aquapacclip - used on the mini and small phone cases, the pager case, and the keymaster pouch - was still waterproof at 40 meters = 131 feet.

2.) In-house testing:

We batch test all our cases during production in our own testing tank for 5 minutes.