Comfort strings, also called arm-saving or multifile strings, are soft, stretchy, flexible and reduce the shock to the arm. They are less durable and due to the high elasticity, these strings also shift on the racket during the game. However, this becomes less important when you have arm and shoulder problems. Also ladies, children and seniors who do not need a stiff and durable string are better off with the properties of a comfort string. Gamma has round and square strings in this category, which have edges due to a special coating to give the ball more spin.