The issue with synthetics today is that there’s been research that shows that synthetics when compared to natural fibers such as cotton or wool, contain high amounts of PFAS and BPAS, cancer containing chemicals that can cause hormonal problems, infertility, etc. PFAS are especially problematic since they do not decompose over time, but instead, they build up in the body, causing terrible issues. I would say avoid all synthetics if you can in clothing or any other material your family would be in contact with on the daily basis. Opt for organic cotton or wool. Facebook marketplace or other face groups that have sellers and buyers would be an excellent place to look for decently priced stuff.