This 8oz egg wine cup is crafted from 304 grade stainless steel with double-wall vacuum insulation technology, highly resistant to rust, absorbing odor, retaining taste and easy to clean by handwhich means the space between the stainless steel walls is void of matter. With no medium for heat to transfer, your drink temperature will not be impacted by the outside temperature. It will always be comfortable to hold and never make a watery mess in your hand or on your table. Keep your drinks cold or hot with this creative and technological cup.