The Alto Half Zip is a performance midlayer built from Woolly Treemerino™, a Swedish-made blend of 60% merino wool and 40% TENCEL™ Lyocell that is warm, stretchy, and lightweight. Merino wool delivers natural insulation and odor resistance, while the Lyocell fiber adds structure and improves moisture transmission. Cut in a relaxed fit, it layers easily under a shell for winter pursuits or works as a standalone piece on cool-weather hikes and post-surf sessions. All materials are renewable, biodegradable, and recyclable, with mulesing-free, traceable wool sourced from Australia.
60% merino wool (19.3µm), 40% EU Ecolabel certified TENCEL™ Lyocell
Woolly Treemerino™ fabric produced in Sweden
Mulesing-free, traceable merino wool from Australia
Relaxed fit for easy layering under a shell jacket
Natural odor resistance and highly breathable construction
Renewable, biodegradable, and recyclable materials
