The HLT1 is a premium, ultra-lightweight helmet liner that incorporates a warm 40 gram 3M™ Thinsulate® lining to maximise worker efficiency, concentration and warmth during cold weather conditions. The outer layer consists of a specially formulated Polyester material that is fully waterproof whilst allowing the head to breathe. Each liner has a universal Velcro fittings on either side to allow it to be used with almost any helmet type. It is anatomically shaped to fit a range of head sizes and does not compromise the helmets fit. A neck/chin brace has a Velcro fastening to ensure a secure, snug fit even in the most challenging conditions.