This Non Spill Temperature Regulated Cup with Lid has been designed to change colour with fluids hotter than 71 degrees C, warning the user to be cautious when drinking. The Non Spill Temperature Regulated Cup with Lid can also be used with a straw. Do not leave the lid in direct sunlight. For further information please contact your local shop or call 01908 644133 (Luton 01582 487878). We look forward to hearing from you.