ProGold Lubricants Biking is an american brand founded in Atlanta (Georgia) specialized in the conception and production of lubricants (without solids!) for bike drive-train (chain, crankset, cogset, freewheel).
ProGold has been a friend of the cyclocross community for years, even helping out those with the muddiest of bikes.
For 2015, Cyclocross Magazine voters overwhelmingly choose ProGold as their favorite lubrication for their cyclocross bike.
ProGold has its standard Prolike chain lube, but for the rougher conditions, the company also offers their Xtreme chain lube.