The Wilson Ultra 108 v4 Tennis Racquet reinvigorates the Ultra series with a simplistic new style and plenty of performance upgrades. V4.0 is built with a new frame geometry and thinner beam construction. FORTYFIVE has been integrated into the lay-up for a softer, more comfortable feel along with enhanced stability. An expanded Sweet Spot Channel at the tip of the hoop adds extra power with less bulk for a sleeker, more aerodynamic look. V4.0 features the Crush Zone grommet system which compresses at impact to boost power and dwell time on strings. Lastly the racquet is finished with a clean-matte color shifting blue that alters its shade depending on the light.