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The OLYMPUS 3.0 LS has a fabric weight of 250g is the warmest base layer from Mons Royale, designed for the coldest days and the biggest adventures. It features a slim fit and raglan sleeves for freedom of movement, mesh gussets in the armpits for better ventilation, and thumb holes. Merino is a soft sheep's wool that wicks the sweat away while keeping the body temperature at an optimal level without any odours.