Stay comfortable, feel cool, and keep warm, all at the same time. Here, Smartwool gives you three merino blend styles that deliver the perfect combination for everyday wear and any time you walk the trails.. . 57% merino wool/40% nylon/3% elastane. Wool blend holds onto warmth while remaining breathable. Merino offers natural odor resistance. Lightweight cushioning creates a comfortable fit and is ideal for everyday use. Crew height. Set of three pairs. Made in USA. 192360435391 33104100006 SW003859