Larger surface area means more air flows in and out of the mask -- without a valve Durable Dura-Mesh® shell prevents collapsing from heat and humidity FlexFit® design fits the contours of the face and mouth for comfortable extended-wear Soft foam...
Larger surface area means more air flows in and out of the mask -- without a valve Durable Dura-Mesh® shell prevents collapsing from heat and humidity FlexFit® design fits the contours of the face and mouth for comfortable extended-wear Soft foam...