Patagonia Womens Merino 1 Silkweight Crew - Finessing the crux moves on a long route or threading your way through downtown crowds, this adaptable top combines the technical merits of merino wool with travel savvy styling. The lightest of our merino fabrics, Merino 1 Silkweight is made to keep you dry and comfortable in warm to hot conditions. Merino is naturally breathable, regulates body temperature and stretches. It's wonderfully soft and naturally resists odor. Our wool comes from non-mulesed Australian merino sheep. We slow wash it for softness and shrink resistance without the use of chlorine, then blend it with 35% polyester (100% recycled) for durability, dry times and moisture transfer superior to that of 100% merino. The set-in sleeves and offset side seams lie smoothly beneath pack straps. Machine-wash cold; machine dry at low temperatures. Fabric is bluesign(R) approved. Details Merino wool/polyester blend keeps you dry and comfortable even when wet, is stronger and more durable than 100% wool, has a softer hand, naturally controls odor, and wicks perspiration 18.9 micron-gauge yarn and jersey-knit construction Self-fabric collar band for comfort Set-in sleeves Side seams offset to eliminate irritation Slow-washed without chlorine to prevent shrinkage; fabric is bluesign(R) approved Machine-wash cold, tumble dry at low temperature 3.5-oz (120-g) 65% chlorine-free merino wool/35% all-recycled polyester 133 g (4.7 oz) Made in Vietnam. Material Chlorine-free Wool Raw, untreated wool has scales that make it itchy and coarse and cause it to shrink, so most wool fabrics are treated with chlorine to reduce the scales. But chlorine is a pervasive pollutant that's especially harmful to organisms living in water and soil. We remove the scales from our merino wool fibers using a unique chlorine-free process that's bluesign approved.