The Isospeed V18 1.17 has above average comfort for a poly-based string. Ideal for players with long, fast strokes, this co-poly comes with an impressive level of spin, feel and precision. It also has a fairly lively response. Given its comfortable feel, this is a great option for players looking to make the transition to the polyester universe. It should also work very well for polyester veterans who could use a little more comfort and pop.