Cover window of flexible display device and flexible display device having the same

An apparatus, comprising:

• a cover window on a flexible display device and including:
• a base substrate that includes an out-folding area, an in-folding area, and a plurality of peripheral areas each disposed on opposing sides of at least one of the out-folding area and the in-folding area;
• a first hard coating layer at a top surface of the base substrate, the first hard coating layer having a substantially uniform thickness;
• and
• a second hard coating layer at a bottom surface of the base substrate opposite to the top surface, wherein
• a thickness of a first area of the second hard coating layer that overlaps with the out-folding area and the in-folding area of the base substrate is less than a thickness of a second area of the second hard coating layer that overlaps with the peripheral areas of the base substrate, an entirety of the thickness of the second area of the second hard coating layer including a same material composition throughout.