Alpinestars Gunner is a 9" boot, so it comes over the ankle and has protection in that area, as well as having a very stiff heel counter. They are cut low in back of the shaft so they offer some flexibility as well as the ability to handle larger calf legs. The Gunner has Alpinestars' proprietary water proofing liner. And, they secure with two patches of Velcro (one large and one a smaller strap), rather than a zipper. This was an issue on most boots as the zipper simply wouldn't reach to fasten around my wife's leg. The Velcro is adjustable and makes for easier fastening while still retaining a secure closure. All in all, she is very happy with this boot!