MaskWorks with the GoPro® HERO [2, 3, 3+ or 4] camera; Super clear lens for perfect color vision; Tempered glass meets all ANSI standards; Silicone facial skirt & strap: soft and comfortable fit; 4-way flex buckle: auto adjust for perfect fit; Quick adjust strap: pull strap to tighten and push button to loosenSnorkelDry top: keeps water out of snorkel when underwater; Purge valve: easily clear any water from snorkel; Full silicone mouthpiece: reduces jaw fatigue; Flex tube: allows snorkel tube to adjust for better fit; Quick release: easily attach and remove dive mask