MONS ROYALE HAINES HELMET LINER The Mons Royale HAINES HELMET LINER is a single-layer, unisex headband from lightweight merino wool. Durable and breathable, it provides excellent thermo-regulation. The headband features flat seams for improved comfort. Merino is a soft sheep's wool that wicks the sweat away while keeping the body temperature at an optimal level without any odours. MONS ROYALE HAINES HELMET LINER