Do wrinkle-free sheets contain formaldehyde?

Most wrinkle-free or permanent press sheets are treated with formaldehyde-based resins that cross-link cotton fibers to prevent wrinkling. Formaldehyde is classified as a known human carcinogen by the International Agency for Research on Cancer (IARC). While the United States does not regulate formaldehyde levels in textiles, countries like Japan and the EU have set limits, indicating that the concern is well-established.

The formaldehyde used in wrinkle-free finishes bonds to the fabric in a way that washing alone cannot fully remove. While initial levels decrease after several washes, bonded formaldehyde resins continue to release low levels of the chemical over the lifespan of the product. Given that you spend roughly a third of your life in bed, chronic low-level exposure from sheets is a meaningful contributor to your total formaldehyde burden.

Choosing untreated organic cotton, linen, or Tencel sheets eliminates this exposure entirely. These fabrics may wrinkle more, but a few creases are a small trade-off for removing a carcinogen from your sleeping environment. ONDU's bedding brands avoid formaldehyde treatments and rely on the natural qualities of their fibers.