This product fulfills its purpose, running inside with prolonged use (> = 10 min.) Only few in (humidity fogging), ie working longer is reasonably possible. The conclusion fits my (possibly nonstandard) facial contour incomplete and loosens the belt constantly, so he re-fitting must be readjusted after each about three times and waste. - Well, there are worse things. All in all, a useful eye protection, I would buy the part because of the good value for money again.
