The fine felt tip on the other side is also useful for underlining

The fine tips can even be used as general pens to write with, soft colors, dry fast too

The "window" on the tip is very functional as well as the fine tip but because of the color I would prefer the mildliners over these.

And the fine tip end lets you underline with ease

The window is really helpful for making lines that are the perfect width, and the fine tip is SUPER fine (even finer than the mildliners)

The fine tip seems to be nicely sturdy

The tip is a strip as opposed to a whole sponge.

Soft pastel colors, firm tips that seem to hold their shape pretty well, even with me

The window is really helpful for making lines that are the perfect width, and the fine tip is SUPER fine (even finer than the mildliners)

innovative tips, using it right now in fact

The highlighters themselves are nice, the window at the broad end is convenient and the fine tip is good for precision

The clear tip helps you have precision, and the colors are so pretty

However, I love the dual tips and that they don't bleed through standard paper.