This stackable polycarbonate mug features deep grooves allowing a comfortable grip in the hand and resists spillage it is suitable for all age groups hot and cold liquids and the virtually spill proof patented valve in the lid prevents spillageonly a small drop escapes before the vacuum seals off the main flowthe 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 w