The Alto Half Zip is a performance mid-layer built from Woolly Treemerino™, a Swedish-made fabric combining 60% merino wool and 40% Tencel® Lyocell for warmth, stretch, and breathability. Merino provides natural odor resistance and insulation, while Tencel adds structure and efficient moisture transmission. With a relaxed fit, it works equally well as a standalone layer on cool-weather hikes or as an insulating piece under a shell jacket in the mountains. The fabric is fully renewable, biodegradable, and recyclable, with mulesing-free, traceable Australian wool.
