Although they seem to fit just fine, they still leak a little bit as the vacuum they make is not very strong. It is acceptable leaking tough. I'm still trying to find the balance between tighter straps and confort. I don't want to ask for a replacement unless I'm sure it is not a matter of putting them in the right position and strap adjustment. The dive is the worst. Everytime I dive I misplace them. Sure, my diving needs work too :) but I'm guessing the vacuum could be stronger as mentioned earlier. Regarding the materials, they are very light, which is good, but I get the feeling the rubber around the eyes could be of better quality. Finally, the case. It screams "made in china" :). You should consider better materials for the case in order to make some justice to the product's value. Keep in mind that these goggles, in Portugal (where I'm from), cost 1/8 of the minimum wage. Hope it helps.