Naish RDM 90 MASTRDM 90 MAST Every Naish mast is quality controlled and checked to ensure proper constant curve bend characteristics for optimum performance. Bases and tops are manufactured separately, enabling Naish to combine a light, responsive mast top with a tough, resilient base. This results in better performance, a lower center of gravity and improved durability and helps riders receive maximum performance out of Naish's sails.