So I have the whole first tested without expensive iPhone 6. The shell keeps super tight. (Opening fall about 2-3 drops of pure. Took me a bit confused at first but could be resolved quickly.) At home, I could only up to a water depth of 50cm test (bath). But think you can rely on the manufacturer's specification.
The touch screen can also operate if the cover is not too wet. Looking forward to make to the next vacation to great pictures in the water.
Consistently an absolute buy recommendation. Have a direct or ordered as a Christmas present.