Tough, shatterproof material prevents accidental breakage. Liquid consumption is easily measured by the marked gradations. The mug is supplied with a choice of lids. A spout lid simplifies drinking. A recessed spillproof lid avoids splashes. Lids from the Independence range also fit. The mug is dishwasher safe and microwaveable, but not the lids. Holds 13.5 ounces.