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.