This stackable, polycarbonate mug features deep grooves allowing a comfortable grip in the hand and resists slippage. It is suitable for all age groups, hot and cold liquids and the virtually spill-proof, patented valve in the lid prevents spillage. Only a small drop escapes before the vacuum seals off the main flow. The Sure Grip Mug has a spout, angled to facilitate easy use. Another feature of this cup is the inclusion of a 100ml and 200ml measure guide on the outside, this comes in useful when volumes of liquid need to be recorded. Microwave and dishwasher safe, available in three colours. The optional lid changes colour if the contents are in excess of 50°C. in temperature.