The Alto Half Zip is built from Woolly Treemerino™, a Swedish-made fabric combining 60% mulesing-free merino wool and 40% EU Ecolabel certified TENCEL™ Lyocell — no synthetic fibers, no compromises. Merino wool delivers natural warmth and odor resistance, while Tencel adds structure and efficient moisture transmission, making this a capable mid-layer across seasons. With a relaxed fit and great next-to-skin comfort, it layers easily under a shell for skiing or wears on its own during autumn hikes and post-surf cool-downs. When the garment reaches end of life, it can be returned for recycling or composting, as all materials are renewable and biodegradable.
