| RefrigiWear Double Insulated Steel Toe Boot #B20 | Black | Ragg Wool/Leather/Thermolite | 9. RefrigiWear ASTM Steel Safety Toe, 10" leather upper, slip resistance rubber bottom, double insulated, felt midsole, removable Thermolite liner, rubber tractor tread outsole. Comfort rating to -75°F. Full Sizes: 7 - 14. RefrigiWear Double Insulated Steel Toe Boot #B20 | Black | Ragg Wool/Leather/Thermolite | 9... - RefrigiWear Double Insulated Steel Toe Boot #B20 | Black | Ragg Wool/Leather/Thermolite | 9. |