The Riffe Frameless Mask is recommended for more shallow dives less than 30 feet. Since this mask does not have a solid frame it is extremely comfortable. All RIFFE masks are made of heat treated silicone rubber to reduce fogging. This frameless mask is made of a durable nylon frame for superior strength. The blend of plastic and silicone are of the highest quality and is evident when handling the mask. The Frameless offers a single lens fitting a variety of face shapes. This mask comes in two lens types, clear and amber. Amber is for increased light, higher contract, and better separation in low visibility.