Your BUFF® headwear is made of pretty strong stuff, in fact it might possibly out last you. However, if you notice a strange aroma after a few months of use, all you need do is either wash by hand using any form of detergent or machine wash at any temperature and it will not stretch, shrink or run as BUFF® headwear is completely colourfast.
Please check the product label as certain products have different washing instructions.
Please note that all Merino products are hand wash only. Do not machine wash.