Mons Royale Men's Arete Merino Insulation VestWarm no matter what. Lightweight warmth with an ergonomic cut and merino fleece panels create freedom of movement for freeriding and ski touring. The Arete can be stashed away in your pack and will provide instant warmth once layered. It has the additional advantage that it will keep you warm even when wet. 80 Merino Wool Insulation combined with our recycled polyester shell fabric gives you sustainable warmth.