The DualShock 4 is PlayStation 4's primary controller; it maintains a similar design to previous iterations of the DualShock series, but with additional features and design refinements.[76] Among other tweaks, the caps of the analog sticks were given a concave design (similar to the Xbox 360 controller), the shape of the triggers and shoulder buttons was refined, the D-pad buttons were given a steeper downward angle to provide a resting space in the center for the user's thumb,[76][77] and the hand grips were made thicker and given microtexturing to improve their fee