It’s always ongoing. The thing we’re trying for is to design a product with a very effective filter, but is also wearable and looks nice. It’s tough, because the more effective the filter, the more uncomfortable it usually is. If you want a perfectly effective filter, you have to seal your face off, but try wearing something like that for longer than a few minutes, it’s very hot and uncomfortable. So we were looking at designs that were a bit more flowing, comfortable, but had a more effective filter, and you’d keep it close to your face so it would act as a seal when you breathe in and out. We tried with lots of users, and did lab testing to test the actual effectiveness of the filter itself. But it’s ongoing.