DA = Downy Advanced fabric softener
Some report that a little DA will make hemp nice & soft
Hemp dipes - most doublers I think are made with hemp, many fitteds are hemp (mine are). Hemp can stink by either not getting clean enough or getting a detergent buildup - with the sudsy wash, then repeated hot washings with just water I can be sure that neither is a problem
CPF - chinese prefolds are cotton
HTH