With the growing trend of having retina displays, an important feature to have is icons that replace some of the fuzzy old images. So why would you do that? Icons are vectorized which means it doesn’t matter how big you scale it up, it always will stay looking crisp and sharp. Images get blurry when viewed on high-resolution displays, however this won’t happen when using X thanks to the retina ready optimization and the use of custom and icon fonts. Be prepared for pixel perfection.