Just coconut oil, no brand and no additives, the stuff you can cook with. Sometimes I melt and mix with a silicone free conditioner, other times I melt and apply plain oil straight to damp or dry hair, either way I then add a shower cap plus microfibre towel turban and sleep on it.

Don't try to wash out before work your first few times do it on a weekend or day off, you don't want to be at screaming pitch with oily patches and running late. You will soon get the hang of conditioner washing out.