The broad area of the opening (nicknamed the "Lily") must be uppermost. It will not work otherwise. Some women think that the broader section should go to the bottom to avoid leakage but trust us - it does not work in that position. Part of that thought stems from a historical concern that no previous device has ever worked properly and been leak free - until the Whiz!
This unique shape was design tested in clinical trials in 2003/4 with over 1,400 women who used it and some 1,000 women at open air festivals in the most trying of conditions. Since 2004 tens of thousands of women have used it worldwide. It works and is leak free.
Download the instructions for use, in either English or French.