The Uphillsport OPS socks are constructed with a 4-layer structure. This provides perfect warmth, moisture control, and breathability - however, the sock is of medium thickness. The OPS has a thermal rating of level 5.

The OPS sock features a fitted heel and an elastane grip in the arch. This offers good support in the mid-foot area and adds comfort by keeping the sock in place without bunching.

Composition:

• 60% Merino wool
• 29% Polyamide
• 10% Polypropylene
• 1% Lycra