The main features of the 306A fully adjustable nylon 4D armrest are its 4D adjustment function and fit to the arm. Its 4D adjustment function includes up and down, left and right, front and back, and rotation adjustment, which allows users to easily adjust the position and angle of the armrest according to their height, body shape, and usage needs to achieve the best support effect. The armrest surface adopts an ergonomic curve design, which can fit the user's arm tightly and effectively relieve arm fatigue when using a computer or writing for a long time. The material and hardness of the armrest are also carefully selected to ensure that users can get enough support when using it without feeling too hard or uncomfortable.