The Hollis M1 Mask is about the pricier aspect, but its modern layout and high-quality elements make it a worthwhile investment for serious divers. The Hollis M1 is usually a frameless diving mask with a 100% pure silicone skirt. It has a minimal profile and might fold flat for packing. https://mask-silicone-mold75061.verybigblog.com/28017820/top-silicone-mask-female-price-secrets