STURDY AND VENTILATED DESIGN: The shoe box lids are made of durable ABS plastic material, providing excellent stability once assembled. Additionally, the rear ventilation holes promote air circulation and prevent unpleasant odors from accumulating.EASY AND STABLE STACKING FOR SPACE-SAVING: Our shoe boxes feature a convenient slot lock design that allows for effortless stacking. Simply "Insert-and-push" to securely stack the boxes together. This innovative design ensures stability, enabling free combinations of boxes while making them easy to move.PRODUCT SPECIFICATIONS: Applicable Size: 13.2” x 9.1” x 5.5” - Suitable for women's shoes up to size 9 and men's shoes up to size 9.5. Please ensure you measure your shoes before purchasing to find the suitable shoe box size.SIMPLE ASSEMBLY AND SPACE-SAVING STACKABILITY: With our 12-pack shoe box set, assembly and stacking are a breeze. The boxes securely stack together using connecting points, saving you valuable space. When not in use, disassembling the boxes requires just two easy steps.EASY ACCESS AND TIME-SAVING: The clear front lid of each shoe organizer allows for effortless visibility and quick access to your shoes. Simply open the lid, and you can easily retrieve the pair you desire, saving you valuable time.