Free Shipping. Patagonia Men's Mainstay Crew (Fall 2008) Thick, warm and livable lambswool, in a jaunty crewneck Specifications: 100% chlorine-free lambswool Features: 100% chlorine-free lambswool in a chunky, 5-gauge knit Rib-knit collar and hem Offset shoulder seams; fully fashioned sleeves Contrast tipping at neck and cuffs Regular fit