Blackstone lovely double wall mugs are every bit as gorgeous as they look. Once you get them, you will stop using conventional glass and ceramic mugs. The double wall feature is great for making it easy to hold without having to worry about burning your hands when steaming hot liquid is poured in. You don't have to wait for it to cool off like other cups or mugs in order to hold it. Considering it is glass, it helps keep drinks warm for a surprising amount of time.

An equally useful advantage of the double-walled cups comes to the fore with cold drinks. The fact that the outer glass cannot become ice-cold eliminates the annoying condensation on the outer glass, which leaves annoying water edges on the tables.

The thermo cups are made of high-quality borosilicate glass. This is absolutely tasteless, resistant (impact and scratch resistant) and extremely heat resistant. In addition, it is the glass, which is almost free of any heavy metal residues, such as lead.