The Daiwa Keiryu Damo V is a very nice, rigid net that is well suited for tenkara or keiryu fishing. For quite some time I have carried folding nets but I have to say I have come to prefer a rigid net.
There is no question that a folding net is more compact in its pouch strapped to your belt. On the other hand, it is very convenient to just pull the net out of your belt and have it ready immediately, and after netting and releasing your fish to be able to give it a quick shake to get the water out of the webbing and then just slide it under your belt again.
Besides, when I carried the folding nets, too many people complained that they couldn't fold them (and truly, if the rim gets bent by trying to fold it incorrectly the first time, it is then almost impossible to fold correctly). By far, more people complained about folding nets than any other item.
The Daiwa Keiryu Damo is available in two sizes, 25cm hoop diameter and 30cm hoop diameter.