Pair Children’s easy grip glass A collaboration between the creative unit tupera tupera and Aderia's "Tsuyoiko Glass." The world of the picture book "Polar Bear's Pants" has been captured in a small glass. What happens when you pour a drink into the glass...? It's a fun glass in which the colour of the pants changes depending on the contents. Medium 'Tupera' Underwear Bear Glass Tumbler * 9cm height * 185ml Small 'Tupera' Underwear Mouse Glass Tumbler * 7.5cm height * 130ml Made of Soda-lime glass, with ion and heat strengthening treatment at the Ishizuka Glass Company in Gifu prefecture, Japan.