Over the years, I have gone through dozens of pairs of Jump Boots. The ones I liked the best were the traditional all-leather lace-up Corcoran type, shown below (both the good ol’ Corcoran II Jump Boot as well as the Corcoran Field Boot, which is a heck of a lot more comfortable.)
Newer Jump Boots have nylon sides for breathability and many now are made only with zippers to make it easier to put them on and take them off. But nothing can really compare to the old WWII traditional style as shown first below.
More pairs of jump boots are shown below the Corcorans, too. And, I couldn't resist posting one of my favorite skydiving pics.

In the pics below, the Corcoran Jump Boot (left) looks almost the same as the Corcoran Field Boot (right), but the comfort is a world apart. The field boot is much lighter on the foot, flexes better, and doesn’t get hot.
Some of my other Jump Boots made by Corcoran, Carolina, and Chippewa are below