The plastics used in the Nude Food Movers range are stable enough to place in a microwave. Our meal box is specifically designed for microwaving, with an inbuilt microvent that allows steam to escape during reheating and prevents food splatter. (This vent can be easily removed for cleaning). We strongly recommend that care is taken when microwaving (do not microwave over ten minutes at a time), and always ensure clips are unlocked before microwaving.