Consider it PPE for your morning cup of coffee. Double-wall vacuum-insulated walls. Made of lightweight 18/8 food-grade stainless steel that is non-leaching and will not retain taste or odor. The double-wall technology prevents condensation on the outside. Designed to fit comfortably in your hand and most car cup holders. Splash-proof pressure fit slide lid. Slide is detachable for easy cleaning. Fifty Fifty brand mug.