This stackable, polycarbonate mug features deep grooves allowing a comfortable grip in the hand & is anti-slip. It is suitable for all age groups, hot & cold liquids & 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 & 200ml measure guide on the outside, this comes in useful when volumes of liquid need to be recorded. Microwave & dishwasher safe, available in three colours. The optional lid changes colour if the contents are in excess of 50