There are very few differences between the PRO and the Non-Valve other than the design.
Both the PRO and Non-Valve are made with military-grade filtration technology that filters out 99% of pollutants and particles including 99.7% bacteria and 99.6% of viruses, but each is slightly more fitting for different situations.
The Cambridge PRO comes with a valve that has been designed specifically to reduce moisture and help regulate CO2 build-up. It helps you to breathe easily and naturally thus, it can be worn for intense physical activity.
Many loyal customers have experienced changes in local and national regulations regarding the use of Valve masks and as a result, our team has worked hard to produce the best option for them; The Non-Valve.
Please note, there is no valve which results in limited ventilation so not advised for high-intensity activities such as running, cycling, or other sports.
If you have further questions, please contact us by email at info@cambridgemask.com or Chat button on our sites to connect with our Customer Service Team.