If you live in a hot place and love gardening, this crazy invention is worth getting. I've tried different neck fans and they all make hot and humid days more bearable. This "hidden duct" design is interesting, but be aware that you're sacrificing airflow a bit. The advantage is that less hair gets stuck. I would probably go for an open design if you have short hair or wear it. However, it is a good neck fan and I think you will be happy with it.
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