Stainless Steel 316(the equivalent of European standard 18/8 or American Standard 18/10), harder and more acid-resistant.
Easy to clean and does not attract dirt.
Easy to use by sliding lid.
Removable handles, they can be removed depending on child's need
100% watertight cup, it does not leak even when the lid is open.
Double wall : reduce loss of heat/cold and isolates the outer wall making it more comfortable to handle.
Easy to clean and hygenic, fully demountable.

Hand wash is recommended.