Made from high-quality plastic and premium materials, these mugs are durable and non-toxic for everyday use and gatherings. Deluxe color-changing function: add ice water or cold drinks and the cup changes color. The color shift becomes more pronounced as the beverage cools, with noticeable changes when the liquid is below about 59 F, especially in winter. Reusable straw set: includes a lightweight straw with a protective cap to prevent loss; easy to carry and clean. Spill-proof design: the straw lid provides a secure fit to minimize spills, and the straw cap adds extra protection during transport. Performance and use: suitable for water, juice, iced coffee, tea and other cold or room temperature beverages; designed for a wide range of occasions and environments. Use scenarios: - Home gatherings or parties to serve drinks with a fun color effect. - Outdoor picnics or events where spill resistance and portability matter. - Office breaks or study sessions for reusable sipping and waste reduction.