A161 - M Face Mask Carhartt's face mask is made of 100% acrylic, stretchable rib-knit fabric. It’s lined with a Thinsulate® Flex 40g insulation for warmth and features an extra-long neck for added protection. One size fits all. The Carhartt label is sewn on the front.* Discontinued *100% acrylic, stretchable rib-knit fabric *Thinsulate® Flex 40g insulation *One-size-fits-all