The Horo is made of silk and rattan, whalebone, and bamboo rods. The rods are tied together in such a way that they form a forward-open sphere or basket. The rods are attached to a holder that can be tied to the back of a rider.
For transport, the rods lie straight next to each other and are opened for use, similar to an umbrella, and tied to the lower part of the holding device. They form a spherical or basket shape. A silk cover is stretched over the frame made from the rods, which can be connected to the rods through loops in the fabric.
When riding, the Horo inflates due to the air entering from the front. It then covers the entire back of the rider. The counterpressure of the incoming air and the compliance of the silk make it possible to intercept arrows with the Horo.
The Horo also has a very important symbolic meaning for Japanese people. It was only used by high-ranking Samurai. If a Samurai was killed in battle, the enemy recognized the high rank of the wearer by the Horo, and so the body of the fallen could be treated with the respect it deserved.
There is a rule in Japan: "If you have killed an enemy who wears the Horo, wrap his head in a piece of the Horo." Cutting the holding ropes of the Horo also indicated a surrender of the battle and readiness for Seppuku.
In naval combat or when there was not enough space to wear the Horo, it was indicated by a special, short standard that was worn like a banner pole (Sashimono) on the back.