100% Merino Wool Long Sleeve Shirt 100% merino wool Imported Backpacker Magazine Review: http://www.backpacker.com/gear/apparel/baselayer/gear-review-baselayers-rivers-west-apex-base-system/ 100% Fine Gauge Merino Wool - itch free / Antimicrobial - Odor Resistant Loose Fit - 25% larger than leading brand for comfort fit after many washes Henley-style neck with 2 buttons and left sleeve embroidery Flat Seam Technology makes this base layer practically unnoticed when close to the skin