The Icebreaker Merino Women's Oasis Long Sleeve Crew Neck is a top-rated silk base layer top on Amazon. Made from 100% merino wool, this top offers exceptional warmth, breathability, and odor resistance. The merino wool fabric is soft, lightweight, and naturally regulates body temperature, making it ideal for various outdoor activities. The crew neck design and long sleeves provide ample coverage and protection. Whether you're hiking, skiing, or traveling, the Icebreaker Merino Women's Oasis Long Sleeve Crew Neck will keep you comfortable and cozy throughout your adventures.