You do not have control of who your childrens' friends are unless you spend all hours with them. And most people are happy nobody can legally sell smokes, booze, and drugs to 12 year olds.
Wool is an excellent fiber for active base layer. Probably in a blend. The bacteria growth on anything poly is brutal, giving me a horrible stink and wrecking my skin once I wear it for more than an hour of activity. Do I want wool as insulation? No, I don't want the weight or time to dry.