Which natural fabrics are best for protecting fertility?

Organic cotton, merino wool, hemp, and linen are the best fabric choices for anyone prioritizing reproductive health. These fibers share critical advantages: they do not shed persistent microplastic particles, they do not contain inherent endocrine-disrupting chemicals like antimony or BPA, and they allow natural temperature regulation around reproductive organs. Organic cotton is especially important for underwear and base layers because GOTS certification ensures the absence of toxic dyes, formaldehyde, and other chemical residues.

Merino wool is an excellent choice for activewear and sleepwear because it naturally regulates temperature, keeping the body cool during exertion and warm during rest. This thermoregulation is particularly important for male fertility, where scrotal temperature must stay within a narrow range. Tencel (lyocell), made from sustainably harvested wood pulp, is another strong option that offers silky softness and excellent moisture management without any synthetic polymer content.

When selecting natural-fiber clothing, look for certifications that verify the absence of harmful chemicals. GOTS (Global Organic Textile Standard) and OEKO-TEX Standard 100 both test for endocrine disruptors, heavy metals, and other compounds associated with reproductive harm. ONDU makes it easy by curating only brands that meet these standards, including Tripulse, Pact, Organic Basics, and Icebreaker, all of which offer full product lines in certified natural fibers.