evo.com | Oyuki Long Underwear Tops > Designed specifically for those who prefer natural fibers, the Oyuki Merino Long-Sleeve base layer is super warm and made from 100% fine Australian Woolmark(R) merino wool so it is soft on your skin. 200gsm Australian Woolmark(R) Merino Wool Flatlock Seams This product may contain chemicals known to the State of California to cause cancer, or birth defects, or other reproductive harm. 84% Merino Wool / 12% Nylon / 4% Spandex Relaxed Fit | Oyuki Longsleeve Men's 2025 - X-Large Black | Nylon/Spandex/Wool