The Head YOUTEK Radical OS Tennis Racquet provides an ideal combination of power and control that every player is looking for. This oversize (107 sq) frame features a large sweetspot along with rest of the Radical’s hugely popular playing characteristics. The YOUTEK frames come with d30

Racquet does not come with a cover.

d3o is a futuristic new material which belongs to the "smart materials" category. Head have placed this new material in the shaft of the racquet. This material can change its behaviour under different conditions. This translates on the tennis court with the d3o  allowing the racquet to adapt to the needs of you - the player. On your high impact (or aggressive) shots the smart molecules will lock together within nanoseconds and dramatically increase the stiffness of the whole racquet frame and therefore providing maximum power. On your slower speed impact shots like a slice or drop shot the d3o molecules will absorb the impact therefore providing a softer touch for better feel. This means passing shots will be even harder and drop shots will be more precise!

The YouTek racquets also feature Head's Teflon grommet system which reduces friction. This holds back the movement of the string by creating a self-lubricating effect in the base material, allowing the strings to slide throught the grommets with nearly no friction. This means the energy loss is minimal.