Sure, but the point is that fabric softener is not necessary.

At the very least in the case of towels (any type), it is actually counter productive, because it makes the towels less absorbent.

On top of that, it means clothes absorb less sweat, which, at first glance, seems like a good thing, until you realise it means your sweat will now stick to your skin longer, because it can't evaporate from your shirt.