Do synthetic athletic socks release microplastics absorbed through foot skin?

What's actually in it

Synthetic athletic socks are typically made from plastic-based materials like polyester, nylon, or spandex. These materials are essentially long chains of plastic. When you wear and wash these items, they break down into tiny fragments known as microplastics.

A 2026 study in Sci Rep confirms that synthetic textiles are a primary source of fragmented fibers. These microplastics are released into the environment during standard washing cycles. While we know these particles are shed from the fabric, the path from your sock to your bloodstream via your skin is a subject of ongoing investigation.

What the research says

The science on how microplastics affect the body is clear about the potential for harm once they enter your system. A 2026 study in Toxicology found that polystyrene microplastics can cause skeletal muscle atrophy by disrupting how your cells use energy and function. This peer-reviewed research highlights that these particles are not just inert bits of dust.

Other studies show that once microplastics enter the body, they can cause systemic damage. A 2026 study in J Agric Food Chem demonstrated that microplastics can disrupt the gut-brain axis and damage brain synapses. Additionally, a 2026 study in J Hazard Mater found that these particles can worsen gut inflammation by disrupting the balance of healthy bacteria in the digestive tract.

While a 2026 study in J Xenobiot identified microplastics in skincare products as a potential exposure pathway, the primary concern remains the shedding of fibers from your clothing into your environment and the subsequent risk of ingestion or inhalation.