Henderson Hyperstretch Zipperless Boot This is one of several new boots without a zipper. Because Hyperstretch is so, well, stretchy, you don't really need one. It also makes walking unusually comfortable because the ankle flexes so easily. Get a snug fit, however. Going down one size from your usual size might work better. The Zipperless also has an exceptionally stiff sole and heel counter and good arch support. The inner sole is only moderately soft, but there's an air-bubble "spring" under the heel like some high-end athletic shoes