Zappos.com is proud to offer the Patagonia - Merino 1 Silkweight T-Shirt (Deep Space) - Apparel: The Merino 1 Silkweight T-Shirt helps manage moisture when you're active in warm to hot weather conditions. ; Slim fit. ; 18.9 micron Merino wool blend fabric. ; Offset side seams help prevent chafing. ; Set-in sleeves. ; 65% Merino wool, 35% ...