Yonex PolyTour Spin G is a durability-oriented high polymer polyester monofilament. Yonex refers to PolyTour Spin G’s five-sided cross-section as its Giga Spin structure. The material is treated using Yonex’s Silicone oil Infused Filament (SIF) process, which is said to increase the string’s snapback after deflection.
According to Yonex, PolyTour Spin G is designed to be stiff to allow players to hit out, while putting less stress on the elbow and wrist. The pentagonal shape enables heavy spin. In conjunction with the SIF, Yonex’s research shows improvements in both the amount of snapback and the speed of snapback.
Yonex designed PolyTour Spin G to give hard-hitting intermediate and advanced male players the heavy spin they want.