Will the Helloface stay see-through when I talk and breathe?

Yes, each Helloface has pioneering, migratory anti-fog technology within the material itself. It's not permanent but we're constantly testing and improving to ensure minimum fogging will occur, keeping the face covering completely transparent.
Wiping the covering can temporarily remove the anti-fog effect and we are working on more permanent technology. Washing many times, soaking or machine washing can remove the anti-fog effect completely. If fogging does occur, please see video below.