Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Teflon coated

Caution: not mentioned in the product description is that this hat is coated with Teflon as a moisture repellent. Ironic considering that people who buy this hat are trying to protect their skin. Teflon is potentially toxic. It's being used less in pots and pans, so I guess the Teflon manufacturers are now selling it to clothing manufacturers.