COLORS OF CALIFORNIA BOOTS. Winter boots with platform in suede. The trick to combat the cold is to keep your feet warm, how to resist these fashionable booties? Their suede upper and wool blend insole make them super warm, and they are also super comfortable thanks to the platform sole. Cut: 100% cow suede Upper: 50% WO 50% PL Insole: 50% WO 50% PL Sole: 100% EVA.