No zipper but a velcro closure. Three Velcro® fastener straps make is able to adjust to a variety of leg and ankle dimensions, so the Radon Drystar® fits you perfectly.
The Alpinestars Radon is a touring boot that takes keeping you dry seriously. The Drystar® membrane is between the upper and the lining to prevent water intrusion. Three Velcro® brand fastener straps adjust to a variety of leg and ankle dimensions, so the Radon fits perfectly on everyone.
* A waterproof membrane does not mean unlimited waterproof. The waterproofness depends on the quality of the membrane. Are you looking for 100% waterproof? Then select motorcycle boots with a GoreTex membrane.