The silicone wristbands are ideal sampling tools because they are comfortable and easy to wear for extended periods of time without harming the person, the researchers write (they had tested necklaces in previous studies but those weren't as appealing). In the study, the researchers were looking for 41 types of flame retardants, as childhood exposure to these chemicals has been linked to health problems including decreased cognitive ability, hyperactivity, and obesity. After the children wore the wristbands for a week, the researchers performed a analysis of the chemicals absorbed by the silicone. They found that 60 percent of the samples contained 11 of those compounds. They detected half the chemicals they were looking for, including several that are no longer produced in the United States. Just which flame retardants the kids were exposed to depended on the age of their house and how often their parents vacuumed.