NCB44 Nils thermal mug features both simple structure and original design! NCB44 is a thermal mug made of the stainless steel with a double wall due to which it keeps the temperature of hot drinks for 12 hours and cold drinks for 24 hours. NCB44 thermal mug offers very comfortable opening system. Just pull the opening handle and you're done. Another great feature is that the bottom of the mug has a non-slip rubber, which increases safety against spilling hot coffee or tea while the mug is open!