Hestra Heater Glove Leather 70% Leather, 30% Synthetic Czone waterbroof breathable insert Rechargable lithium-Ion batteries Grease the leather regularly and it will resist moisture, wear and tear better. Use a polishing cloth and rub in the grease until the leather is saturated. Do this in the evening and the grease is absorbed during the night. Avoid silicon impregnation. China