A thermo flask is a household item that is used to keep things warm or cold for a long time. What is the use of silvered wall in thermo flask?
![MIRA 24 oz Stainless Steel Water Bottle with Straw Lid, Vacuum Insulated Metal Thermos Flask, Olive - Walmart.com MIRA 24 oz Stainless Steel Water Bottle with Straw Lid, Vacuum Insulated Metal Thermos Flask, Olive - Walmart.com](https://i5.walmartimages.com/asr/3d82bf73-e283-4f4a-b326-c77014ad42ea.ef76ffe221be9bdbc627ccebbd29fe28.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
MIRA 24 oz Stainless Steel Water Bottle with Straw Lid, Vacuum Insulated Metal Thermos Flask, Olive - Walmart.com
![Vacuum Flask Instruction – Insulated water bottle Care in Use | Custom Insulated Water Bottle Manufacturer, vacuum flask Supplier | Hono Vacuum Flask Instruction – Insulated water bottle Care in Use | Custom Insulated Water Bottle Manufacturer, vacuum flask Supplier | Hono](https://honogo.com/wp-content/uploads/2019/10/USE-AND-CARE.jpg)