Is the liner in Humvee shorts removable?

yes

Cool, what’s the difference between these and zymes?

Sorry I don’t know – all I know is that the liner on my humvees (both long and short) is removable.

humvee is lighter material with zipped vents and pockets, zyme is thicker, heavier and more durable in cotton look material with no liner.

zymes also come up a size larger than the humvees!

The same liners will fit in the Zyme as will the Humvee. But they do come up very big, so get (at least) one size smaller than you normally would.