The Alto Half Zip is a versatile mid-layer built from Woolly Treemerino™, a Swedish-made fabric combining 60% merino wool and 40% Tencel® Lyocell for warmth, stretch, and breathability. Merino wool provides natural odor resistance and insulation, while Tencel® adds structure and improves moisture transmission — with no synthetic fibers in the blend. The relaxed fit makes it easy to layer under a shell jacket for skiing or wear on its own during cool-weather hikes and post-surf warmups. Made from renewable, biodegradable, and recyclable fibers, it's designed to be returned for composting or recycling at end of life.
