Hanhaba obi , is an unlined and informal obi that is used with a yukata or an everyday kimono. Hanhaba obis are very popular these days. For use with yukata, reversible hanhaba obis are popular: they can be folded and twisted in several ways to create colour effects. A hanhaba obi is 15centimetres (5.9in) wide and 300centimetres (9.8ft) to 400centimetres (13ft) long. Tying it is relatively easy, and its use does not require pads or strings. The knots used for hanhaba obi are often simplified versions of bunko-musubi. As it is more "acceptable" to play with an informal obi, hanhaba obi is sometimes worn in self-invented styles, often with decorative ribbons and such.