Is the KEEN Targhee IV actually waterproof?

Yes. It has a waterproof membrane and sealed construction, so rain, wet grass and shallow puddles stay out. It is not a wading boot, so deep water can still get in over the collar.

How does the Targhee IV compare to the Targhee III?

The IV is the newer generation with the same roomy fit and waterproof build. KEEN has revised the outsole and cushioning over earlier versions, so try the IV if you want the current fit and support.

Does it run true to size?

Most owners say it fits true to size with a roomy toe box. If you wear thick socks or have wide feet, KEEN's wide options and the generous toe box usually help.