IST SONIC MASK BLACKIST Sonic Mask Black The IST Sonic Mask Black is an extreme low volume, frameless diving mask designed for both SCUBA and freediving enthusiasts. Crafted from hypoallergenic liquid silicone, it provides a comfortable, secure fit while minimizing pressure on the face. Its frameless construction reduces internal volume, making equalization easier and improving overall hydrodynamics underwater. The mask features a deep nose pocket for a more comfortable