A protective suit is worn by Barry Allen as the Flash to hide his identity from his enemies when he fights crime. It is red and bears golden lightning bolt design on the chest, backed by a white plate.

Why did they change the Flash costume?

Fourth suit

Barry in his new, upgraded suit as the Flash. Sometime after the defeat of Savitar, Cisco designed a new suit in the hopes of Barry returning from the Speed Force, which coincidentally looks exactly like the one Barry's future-self wore when 2017 Barry ran to 2024.

Why does Flash wear the suit?

On The CW's hit show, The Flash, it's often pointed out that the Flash's suit is made out of a friction-less material that allows him to run without burning up the suit in the process. ... In the comics, Barry Allen uses the speed force to create an aura around him that acts as a shield between him and friction.