Sip your tea in style with this glass mug, which has a double-walled design to provide insulation and ensure beverages stay hot or cold. The mug features an elegant luna moth design and comes with a clear quartz crystal tea infuser, which allows loose-leaf tea to steep naturally while infusing your water with the soothing energy of the clear quartz. Please pre-warm the mug with warm water before adding hot water. Avoid sudden temperature changes.