 Buckwheat tea, known as "kuqiao-cha" (苦荞茶) in China, "memil-cha" () in Korea and "soba-cha" () in Japan, is a tea made from roasted buckwheat.Buckwheat hulls are used as filling for a variety of upholstered goods, including pillows and zafu.The hulls are durable and do not insulate or reflect heat as much as synthetic filling.