The Zone overstable putt and approach disc is the go-to workhorse putter for dependable overstability in any conditions. Often used for technical approaches or powerful upshots for both forehand and backhand players. Engineered for optimal grip and colder weather conditions, the ESP FLX promises to be a mainstay in your collection. Rain or shine, winter or summer, this material remains steadfast in its structure and stability. It's specially crafted for all-weather play, but it truly shines in the colder conditions.