Tens of thousands of mattresses that were sold exclusively at Costco stores have been recalled due to the risk of possible mold exposure.

Manufacturer FXI Inc. initially announced the recall of Novaform ComfortGrande 14-inch mattresses and Novaform DreamAway 8-inch mattresses in June and issued a joint press release with the Consumer Product Safety Commission on Thursday. According to FXI, the recalled mattresses could have been exposed to water during manufacturing, leading to potential mold development.

Recalled mattresses were manufactured in a variety of sizes, from twin to California king, and ranged in price from $150 to $750. All of the Novaform mattresses were sold between January and June this year at Costco stores and on Costco’s website in northwestern states, as well as California’s San Francisco Bay area. Costco, according to the CPSC, is reaching out to known customers who purchased the recalled products directly as well.

The CPSC said FXI has received reports of 541 cases of mold on mattresses but no related injuries have been reported so far.