We have several Mighty Mug models with different heat retentions.
Stainless Steel Go = 6 Hours Hot, 14 Hours Cold
Stainless Steel Biggie = 6 Hours Hot, 14 Hours Cold
Stainless Steel Solo/Mini = 4 Hours Hot, 14 Hours Cold
Stainless Steel Mini = 4 Hours Hot, 14 Hours Cold
Plastic Go = 1 - 2 Hours Hot/Cold
Plastic Solo = 1 - 2 Hours Hot/Cold
Plastic Mini = 1 - 2 Hours Hot/Cold
Ice = 1 - 2 Hours Hot/Cold