Although their design is kept in simple round shapes and intended for everyday use, these glasses are something special. The BISTRO glasses are made of extremely heat-resistant hand-blown borosilicate glass and therefore have excellent insulating properties. Under the glass bottom is a hydrophobic silicone membrane, which serves to equalize pressure between the glass walls. It allows the glass to "breathe" so that no condensation forms on the glass surface and no unsightly water wreaths remain. The BISTRO glasses are suitable for chilled drinks and coffees of all kinds.• Made of double-walled borosilicate glass for better insulating performance: hot drinks stay hot longer and cold drinks stay cold longer• No risk of burns for the fingers with hot drinks• No condensation forms in cold drinks and therefore the glass leaves no unsightly water wreaths• Hand-blown glass Colour: Transparent Material: Borosilicate glass, silicone Dimensions: LxWxH: 11.40 x 0.11 x 11.40 cm