The Hollis M1 Mask is over the pricier side, but its ground breaking structure and high-quality materials make it a worthwhile investment for serious divers. Keep them outside of sunlight and fluorescent lights. In the event the mask gets to be distorted (bear in mind latex is a pure products) https://emilianoillmo.gynoblog.com/28014552/helping-the-others-realize-the-advantages-of-why-are-silicone-masks-so-expensive