suede, leather, synthetic (nubuk?) outside
Gore-Tex with a polyester liner
Juan: The boot is comprised of GoreTex, suedeleather and synthetic upper frabics with a rubberized toe and a band running around the edge of the sole. I am very happy with the quality, fit and comfort of this boot. If you get a pair, get a half size larger for foot swelling and thicker socks. Good Luck!