The Aquanaut freediving mask features a new design of silicone skirt which has been developed to fit as many face shapes as possible from a single design.The low volume freediving mask, whilst compact in size, offers a surprisingly wide field of view, making this not just great for freediving, but a very capable all-purpose mask. It is fitted with a molded silicone strap which is interchangeable with a fourth element 100% recycled mask strap (sold separately).Zero plastic packagingWe, Fourth Element, set out to reduce and remove all plastic waste from all our masks. Instead of packaging our freediving mask in traditional hard plastic cases, we&&';;ve opted for a zero plastic, low volume mask case. Universal fit freediving mask Wide field of vision Soft silicone skirt Molded silicone mask strap Tempered glass lens Easily interchangeable straps Low volume plastic free protective mask case included Contrast Lens - Filtering out some of the mid-range wavelengths of light in the visible spectrum, the Contrast lens has a green/blue appearance. Silicone Care:Immediately after diving, rinse your mask with fresh water until you can fully clean it.Use warm, fresh water to rinse the mask. This will dissolve salt crystals that are stuck to the mask.Rinse the mask thoroughly using fresh or filtered water.Towel dry the mask completely.Do not use abrasive mask / lens cleaner on masks with tinted or coated lenses