I give it five stars... Firstly, it has a very good fit... Secondly, it doesn't fog up at all... You need to know for what purpose you want it... It is incredible for snorkeling, it has a great view of the seabed from above... It is not suitable for fishing or free diving... but it is ideal for snorkeling... To prevent fogging, we do the usual... with the purchase, we burn the crystal as many times as needed, one or two, maybe even three times... then wipe the crystal with a dry tissue... apply toothpaste to the crystal... and then rinse it... Before entering the sea, we follow the known procedure... we spit on the lenses, rinse the mask in the sea... wet our face first... and then put on the mask... If you do these simple things, no mask will ever fog up on you.