Sitka Core Merino 220 Bottom - Layer the midweight Core Merino 220 Bottom when the fall frost arrives. Merino wool has a high warmth-to-weight ratio to keep you warm without a ton of bulk, and it regulates temperature well so you don't overheat. Merino wool is also naturally odor-resistant to help you stay undetected, and ArmorSpun merino wool is reinforced with nylon to make it last. Lightweight 220-gram, 17.5-micron ArmorSpun Merino Wool for durability and anti-itch comfort; Easy-care merino wool can be washed and dried with your regular laundry; Low-profile flatlock stitching for next-to-skin comfort; Total weight: 221g; Style: 600206;