61% Merino Wool
Here's what other sites are saying:
Rising to just below the calf, this Merino-wool mini crew sweet compromise of freedom and warmth. Omni-Dry advanced evaporation pulls sweat from your skin and keeps the cool air flowingsimply adding to Merino wools exceptional heat regulating capabilities. Its also naturally anti-microbial and supremely cozy. Cushioning in the heel and ball protects your foot from jarring. A seamless hand-linked toe banishes pressure points and abrasion.
- Altrec Outdoors refers to the men's version