California's Proposition 65 (Prop 65) entitles California consumers to special warnings for products that contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm if those products expose consumers to such chemicals above certain threshold levels. Huckberry does sell some products that contain certain chemicals identified in Proposition 65.
More information about Prop 65 warnings is available at https://www.p65warnings.ca.gov/