Women's Ultralight Mid Sock

The Ultralight Mid Sock is On's racing sock — an ultrafine-gauge yarn construction designed to feel like running sockless, with thick heel and toe padding and anti-blister patches where needed. Ankle coverage keeps dirt out on trail. Ultralight Mid Sock — ultrafine-gauge recycled polyamide, designed to feel like running sockless. Thick heel and toe padding, anti-blister patches.

Inside the On range, Ultralight Mid is the race-day sock: ultrafine gauge to cut weight and bulk inside racing shoes, targeted heel and toe padding for shoes like Cloudboom Strike and Cloudboom Max, and a close, seam-minimised fit designed not to add friction over 42 km.