About this 3D model

To avoid the uncomfortableness of breath and friction on skin around the lip while wearing a mask, the frame can expand the space between skin and mask. If you don't feel good when frame contact your cheek, glue a piece of non-woven cloth on the side of frame. If the shape of frame doesn't fit you face, reshape the frame by hair dryer or heat gun. I hope it useful when you wear a mask with the frame.