Gila Isolating Mug The Gila Isolating Mug is a double-walled mug that ensures that your drink stays at the right temperature. The Gila isolating mug has a volume of 330ml. This mug has an outer wall made of stainless steel, and an inner wall of plastic. The Gila Isolating Mug is available in 6 colors. The Gila Isolating Mug has a cap with a handy drinking hole. This cap you can turn on. The mug is easy to wash off. You can print your own design or logo design on the tumbler. You can print your design or logo in up to 4 colors. Also, you can engrave your logo. The Gila Isolating Mug is BPA-free production.