The JPMBB is designed as a hybrid between woven and knitted, it's not a simple stretch wrap.
There are good and bad baby wraps, everyone agrees on that. In any case, only take into account the opinions of those who have tried the JPMBB wrap and not another one.
More info on Love Radius fabric.
There are several stretch/soft baby wraps. Some are made of simple cotton jersey (knits), narrow and indeed not very durable.
