Optical laminate

An optical laminate, comprising:

• a polarizing layer;
• and
• a porous layer formed on at least one side of the polarizing layer,
• wherein the polarizing layer comprises zinc component, and
• wherein an absolute value of a change in an amount of color coordinate a* of CIE L*a*b* according to Equation 1 is 2 or less:
• Δa*=a*a−a*i [Equation 1]
• wherein Δa* is the change in the amount of the color coordinate a*, a*a is a color coordinate a* of the optical laminate after maintaining the optical laminate at 105° C. for 250 hours under a state where both top and bottom surfaces of the optical laminate come in contact with glass substrates, and a*, is a color coordinate a* of the optical laminate before maintaining the optical laminate at 105° C. for 250 hours.