Sidi Armada Gore Tex Motorcycle Boots Black US8.5/EU42 (More Size Options) Sidis new Full Grain Microfiber material is used for the uppers construction. The Gore-Tex membrane breathes more than any other membrane thus the riders feet will stay cooler in warm weather with a Gore-Tex equipped boot. Secure Hook and Loop Closure over full length zipper entry/closure system. Dual position zipper closure points to adapt to any calf size. An elastic panel adjacent to the entry zipper allows a bind free zip.