SITKA Gear Men's Core Merino 330 Half-Zip Base Layer - Lightweight Thermal Underwear for Hunting & Outdoor Activities

Built for frigid late-season sits, the heavyweight Core Merino 330 Half-Zip features our warmest-weight merino wool to keep you warm in the coldest conditions. Merino wool has an exceptional warmth-to-weight ratio to keep you warmer with less bulk and it regulates temperature through stop-and-go pursuits

Lightweight and durable 330-gram, 17.5-micron ArmorSpun Merino Wool exterior fabric

Recycled synthetic interior for anti-itch comfort and improved moisture management

Easy-care merino wool can be washed and dried with your regular laundry

Snag-preventative stitching along sleeves resists abrasion from your pack