Heko obi , is a very informal obi made of soft, thin cloth, often dyed with shibori. Its traditional use is as an informal obi for children and men and there were times when it was considered totally inappropriate for women. Nowadays young girls and women can wear a heko obi with modern, informal kimonos and yukatas. An adult's heko obi is the common size of an obi, about 20centimetres (7.9in) to 30centimetres (12in) wide and about 300centimetres (9.8ft) long.