The black sidi hydro goretex cycling shoes have a waterproof and windproof gore tex upper and membrane which will protect your feet from the elements helping to keep them warm and dry fastening with four velcro straps to keep your foot secure the cycling shoes have a slightly roomy fit to accommodate thicker winter socks boasting a reinforced heel which keeps the foot in optimum position the bike shoes are set upon the sidi millennium 3 sole which is constructed from injected carbon fib