 The most common version of the Polyglas found on muscle cars of that era was the Polyglas GT, which was one of the first commercially available raised white lettered tires on the market.Other versions of the Polyglas lineup were offered as blackwall, redline, whitewall, and snow treaded tires.For driving in winter, Polyglass Pathfinder line of tires were available in special versions for the steering front and rear driving axles along with optional "Safety Spikes" (studs).