Trail Running / Mountain Running 37.1% merino wool, 20.7% cotton, 20.5% nylon, 16.0% polyester, 5.7% spandex (excluding decorative yarn) Premium merino wool yarn offers natural moisture management, breathable warmth, and odor resistance for lasting comfort Lycra® fiber provides a snug, adaptive fit that wraps the foot securely without restriction Terry cushioning at toe and heel absorbs impact and reduces pressure during long runs Breathable mesh panels enhance airflow and accelerate moisture release to keep feet dry Seamless toe construction minimizes friction and helps prevent blisters Ergonomic 3D heel design ensures a secure, non-slip fit Arch support band delivers a locked-in feel and improves stability during movement Left/right specific construction enhances natural fit and all-day comfort