Wool is hypoallergenic. 'Allergic' reactions are often confused by itchy skin from an extremely coarse wool fiber used in a sweater some 30-50 years ago. Those same folks (one of us included) are likely spending loads of time wearing merino wool now. More to the point, we have installed in countless chemically sensitive occupant scenarios with zero issues. Ultimately it is always best to test directly for any reaction.
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