The Winter Helmet Liner is made of soft, stretchable fabric for a secure fit. Wear under a hard hat or alone, the Helmet Liner provides warmth from soft, polar fleece fabric on the crown. Windproof fabric surrounds the bottom of the Helmet Liner for ear protection. Reflective accents on logo. One size fits most. Helmet Liner is made of soft polar fleece on crown. Windproof fabric covers ears. Comfortable, snug fit under hard hats or alone. Reflective logo. One size fits most. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.