Introducing the Sigma Girl Color Changing Mug, exclusively available at The Drawing Desk. This 11oz mug is the perfect gift for any Sigma Girl fan, as it features a heat-reactive surface that reveals a custom design once the mug gets warm. The color-changing effect is sure to amaze and delight, making this mug a standout addition to any collection. Plus, it's the gift that keeps on giving, as the design will change every time a hot beverage is poured in. Don't miss out on this must-have item for any Sigma Girl enthusiast.