Best liner material?

Ahhhh and flour sack towels are amazing 

Hemp for inserts and fleece liners 

Charcoal absorbs quickly & holds a lot. Hemp probably holds the most. Bamboo is trim & absorbent. Microfiber works for some people but I've known more who hate it than love it (myself included). Personally I used a charcoal closest to my baby and a 3-layer bamboo or hemp under that. Infallible! 

FST's are supposed to be great. Added to other inserts. Also, I hear micro fleece is good at pulling moisture away.

I made all mine and they're a combination of unbleached terrycloth and bamboo / organic cotton sandwiched in between

Hemp is the "cadillac" of inserts! Very absorbent.