Fender Footwear - Solo Leather (Brown Oiled Leather) - Men's: The solo leather upper is oiled leather for soft hand, natural fit and a classic vibe. Inside lining is natural cotton drill for genuine vintage look. Fender Footwear's exclusive polyurethane Comfort Amplifier(R) insole provides the ultimate in cushioning and support. The bottom unit has cured, vulcanized rubber foxing and gum rubber outsole.