All stainless steel is double walled and keeps drinks hot or cold.
The 4 in 1 can cooler fits a regular can, skinny can, glass bottle and comes with a lid to use as a tumbler.
Ceramic mugs are microwave safe.
for longevity it is best to hand wash all items as they are handmade
Do not leave liquid in the glass cans for long periods of time, due to the natural properties of bamboo the lid will mould if liquid is left in it. Please air dry after each use.