On Running's Core Run Sock Mid is a performance-oriented mid-calf sock designed for runners seeking comfort, breathability, and targeted support. Crafted from a lightweight, moisture-wicking blend (likely merino wool and synthetic fibers), the sock features strategic mesh zones on the instep and ankle for enhanced ventilation, while reinforced cushioning under the heel and ball of foot provides impact absorption during high-mileage runs. The iconic 'ON' logo is prominently displayed in black on the outer shin and subtly woven near the toe—consistent with On’s minimalist, functional aesthetic. A ribbed cuff ensures secure fit without constriction, and the seamless toe construction prevents blisters. Ideal for daily training, tempo runs, or long-distance marathons, these socks pair seamlessly with running shoes and offer all-day comfort thanks to their engineered fit and odor-resistant properties. The packaging confirms size M (US Men’s 8–11.5 / EU 43–46) and identifies the product as 'Core Run Sock Mid 2P', indicating a two-pack set. Clean white colorway ensures versatility across athletic and casual styling.