I’ve always been impressed with Danish brand Bodum’s double-walled glasses– the breath taking design has been available in a variety of sizes for espresso shots, etc. for a while. (Product Dose has a great Brand Wiki on the company by the way). They recently introduced a double-walled sake glass made from their signature Borosillicate construction which is both heat and scratch resistant. Kitchen Universe has a set of six available for a whopping $22. Great deal for a gorgeous set of unique sake-sipping glasses!