Microwavable Borosilicate Glass: Crafted from high-quality borosilicate glass, these lunch boxes are safe for microwave use, allowing you to conveniently reheat your meals without transferring to another container. | Double Jacket Insulation: Each 400ml container is thoughtfully paired with its own jacket, offering advanced insulation for both hot and cold meals. Enjoy your food at the right temperature, anytime and anywhere. | Crystal Clear Visibility: The crystal-clear glass design not only lets you effortlessly identify your stored meals but also showcases their appetizing appeal. An excellent choice for home, office, or on-the-go usage. | Secure Sealing Technology: The lids feature a secure sealing mechanism that prevents leakage, ensuring your meals stay fresh and mess-free during transport, making them perfect for busy lifestyles. | Effortless Cleaning and Maintenance: The smooth glass surface ensures easy cleaning, and the removable jacket adds an extra layer of convenience. Elevate your lunchtime experience with this practical, elegant, and versatile lunch box set.