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Cold caps, also known as scalp cooling caps or cryotherapy caps, are devices that are used to reduce hair loss during chemotherapy treatment. They work by reducing the blood flow to the scalp and lowering the temperature of the scalp, which can help to prevent the chemotherapy drugs from reaching and damaging the hair follicles. Cold caps are usually worn for a period of time before, during, and after chemotherapy treatments, and are typically worn in combination with other techniques to minimize hair loss. It is important to note that while cold caps may be effective in reducing hair loss, they do not work for everyone and may not be suitable for all chemotherapy regimens.