Merino Ultra Sock

On's Merino Ultra Sock is a dedicated trail running sock built with a high-tech ergonomic construction, combining merino wool with recycled polyamide and polyester for heat regulation, comfort, and protection across demanding terrain.

• Material: 47% Polyamide, 34% Merino Wool, 15% Polyester, 4% Elastane 
• Color: Heron
• Merino wool blend for natural heat regulation and comfort
• Zonal terry cushioning for targeted protection underfoot
• Open mesh channels for active ventilation during trail running
• Anti-slip underfoot technology for secure footing
• Arch and upper heel support for a locked-in fit
• Ergonomic toe construction for reduced friction and improved fit
• Reflective yarn on cuff for low-light visibility