This is a Fukuro obi
with classy phoenix
and 'karabana' (imaginary flower in china) pattern, which is woven.
Sparkling gold threads used makes this obi suitable for a formal usage.
Textile is soft silk.
There is a small stain above Otaiko pattern, but it will not show when tied properly.
It has some other flaws, such as a prominent folding line, as shown on photos.
Please see photos for details.
Overall, it is in very good condition and can continue to be worn even as a formal usage.