Allegro Industries’ winter products include: Winter Liners, Knitted Tubes, Mouth/Chin Covers, and Warming Packs to protect outdoor workers from extreme cold and wind. Knitted Tubes and Mouth/Chin Covers are offered in a standard model and a deluxe model. The standard Knitted Tube fits over the hard hat and is made of 100% polyester.Allegro Industries,, (800) 622-3530.