The link provided below is a high quality mask for soldering, view the link description.
"Workplace applications include welding, brazing, soldering etc..."
http://filtera.stores.yahoo.net/3mmod82n95pa.html
Today, it is also advisable to simple remove the solder fumes via an extractor, the latter would also
eliminate the aspect of a mask which can become uncomfortable.
Furthermore, take the time to search the internet for price along with features that you will desire.
http://www.sentryair.com/solder%20fume.htm
http://www.sentryair.com/solder-sentry.htm
http://www.howardelectronics.com/xytronic/426dlx.html
http://www.elexp.com/sdr_6dlx.htm
http://www.engineeringlab.com/fumeextractor.html
http://www.mcminone.com/product.asp?catalog_name=MCMProducts&product_id=21-7960
-Omni