We highly recommend hand washing the outer shell to preserve the life of the silicone seal. Yumbox is designed with rounded edges and smooth surfaces to make hand washing easy.
Yumbox is dishwasher safe. Top rack only. Please remove it before the heat dry cycle. Yumbox is tested at temperature a 65C/149F, 110 min. cycle. Yumbox is made with ABS (exterior box), Tritan (tray), and silicone (seal).
Special Care instructions for the silicone seal: Please be sure to empty contents each day, hand wash with warm soapy water and thoroughly dry your Yumbox before storing. Also, if you live in a damp or humid environment, leave Yumbox ajar, not sealed when storing. If you pack oily foods regularly, coat with a baking soda paste once a week overnight to avoid build-up.