This is the Seasoft Pro 6mm Commercial Drysuit Hood for use with a Full Face Mask Features: The three back panels are compressed neoprene for thermal protection Hood does NOT get thinner as you are getting deeper SEASOFT uses 4 different types of neoprene to make these hoods The best commercial diving hood available anywhere The SEASOFT PRO / M6 6 mm Drysuit Hood is designed to be worn with a full face mask. It has a skin-in seal facing the diver&';s face AND a skin seal facing out toward the mask with a layer of tough nylon fabric sandwiched in between the two.