L.L. Bean is recalling children's insulated water bottles because of concerns about lead contamination.

The Consumer Product Safety Commission says the bottles were imported by GSI Outdoors and sold by L.L. Bean from July 2015 through May 2016 for about $20. The 13.5-ounce bottles have five prints: sharks, dinosaur bones, camouflage, flowers and butterflies.

The Maine-based retailer said it specified lead-free water bottles, but routine testing by the Chinese manufacturer revealed lead solder had been used to seal the bottoms of some of the bottles.

A spokeswoman says L.L. Bean is instituting a voluntary recall. Consumers should stop using the water bottles and reach out to L.L. Bean to return the product for refunds.