12oz Double Wall Insulated Mug Stainless Steel Mugs Drinkware with Handle.       That is actually a very common and good combination for an insulated cup 👍
 
Here’s why:
 
🔹 Stainless Steel 304 (Inner Layer)
 
This is the most important part because it touches your drink.
 
* ✅ Food-grade & safe
* ✅ Rust-resistant
* ✅ Does not affect taste
* ✅ Durable for hot & cold drinks
* ✅ Easy to clean
 
304 is considered high quality for drinkware.
 
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🔹 Stainless Steel 201 (Outer Layer)
 
* ✅ Strong and durable
* ✅ More affordable
* ✅ Good for structural support
* Slightly less corrosion-resistant than 304
 
Since the outer layer doesn’t touch your beverage, using 201 outside is cost-effective and practical.
 
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🔥 lt’s a Good Insulated Cup
 
it’s double-wall vacuum insulated, this combo works very well:
 
* Keeps drinks hot for 6 hours
* Keeps drinks cold for 9 hours
* Prevents sweating on the outside.        Use: Home, Office, Sports, Travel, Hotel, Gift, Hiking, Camping, Wedding, hot and cold drinks, Vacuum Flasks