TL;DR: Different areas of your body absorb substances at dramatically different rates — the scrotum absorbs at 11.8x the rate of your forearm. This means the fabrics touching your most sensitive areas matter enormously, making natural fibers a healthier choice over synthetic materials like polyester.
How absorbent is your skin?
Our skin is a remarkable organ, not just for its protective function but also for its ability to absorb substances. Various studies have shown that different parts of our body exhibit varying rates of absorption. Notably, the scrotum has been identified as having the highest rate of absorption (11.8x more absorptive than skin on your forearm), making it imperative to be mindful of the fabrics that come into contact with these highly absorptive areas.
Why does polyester pose a risk to highly absorbent skin areas?
Polyester is a synthetic fabric derived from petroleum. As we explored in a previous blog post, polyester production involves a chemical-intensive process that raises concerns about its impact on both the environment and our health. Now, consider the implications when polyester clothing comes into direct contact with areas of high absorption. It's a recipe for exposing our bodies to a range of substances — including microplastics, phthalates, and antimony — that may have unforeseen consequences.
Why are natural fibers safer for your skin?
At Wayve, we prioritize your health without compromising on style. Our commitment to using only natural fibers in our clothing is rooted in the understanding that what you wear matters. Natural fiber clothing made from organic cotton and merino wool allows your skin to breathe, eliminating the risk of potential irritants and harmful substances being absorbed into your body.
The Quad Short is made with GOTS-certified organic cotton and a merino wool liner — protecting the areas that matter most with certified natural materials. The Classic Short offers the same organic cotton protection at an entry price point. And the Only Tee keeps your upper body in organic cotton.
How does exercise increase skin absorption?
During exercise, your skin becomes even more absorbent. Increased blood flow, elevated skin temperature, and open pores all contribute to higher absorption rates. This means the chemical exposure from synthetic workout clothing is amplified during the exact moments you're pushing your body hardest. Choosing natural fibers for activewear isn't just a preference — it's a health decision.
For women, the Flow Set delivers high-performance merino wool activewear that works with your skin, not against it.
Frequently Asked Questions
Which body part has the highest skin absorption rate?
The scrotum has the highest absorption rate, at 11.8x higher than the forearm. The underarms and groin area also have significantly elevated absorption rates, making fabric choice especially important for clothing that contacts these areas.
Does sweating increase chemical absorption from clothing?
Yes. Sweating opens pores and increases blood flow to the skin's surface, which can enhance absorption of chemicals present in synthetic fabrics. Heat and friction further accelerate the leaching of microplastics and chemical additives from polyester.
What is the safest fabric for workout shorts?
Organic cotton and merino wool are among the safest options. They are free from synthetic chemicals, don't shed microplastics, and allow the skin to breathe naturally. Look for GOTS certification on cotton and RWS certification on wool for additional assurance.