Zafus are round cushions, about 14 inches in diameter. Zabutons are large flat square floor pillows, about 20-30 inches long on each side. They are both traditionally used together by the Japanese to make lengthy sitting meditation more comfortable. Zabutons double as a yoga bolster when folded in half.
At YOGAaccessories.com, our zafus and zabutons are filled with 100% cotton and have a removable cushion (for easy cleaning), or a side zipper to make the replacement of filling easy!