The perfect mask for divers who use optical lenses to improve their underwater view. The attractive low-volume dual lens Flux Twin comes with a strong, impact-resistant polycarbonate frame to withstand lots of use and abuse. The hypoallergenic, silicone skirt features a double-feathered edge to provide a comfortable, watertight seal on a variety of face shapes. The non-slip strap and easy adjust buckles let you dial in the perfect fit and provide enjoyable diving. Mask lenses are tempered glass and the easy to reach one hand nose pocket makes for easy ear equalization. Mask comes with a protective mask box. For optical lenses see SKU: SCPFTCL). Diopter lenses are easy to install and are available in -1.0 to -8.0 in .5 diopter increments.