TUSA M211 Freedom One mask developed with revolutionary Freedom Technology delivering superior fit, comfort and performance. The Freedom One is the first of a new generation of TUSA masks offering this innovative new technology combined with superior design, build quality, materials and frame construction. Low profile, low-volume 2-window teardrop design. Features TUSA's Freedom Technology. Skirt mounted Quick-Adjust Buckle System. Round-edge skirt for maximum fit and comfort. 3-D strap for ideal anatomical fit.