A Field Company leather handle cover in brown, Standard size (ALHC-BR). Vegetable-tanned leather from American hides, tanned in a U.S. tannery with tree bark and other natural tannins, then cut and sewn in the USA. Official page lists Standard as the size for Field skillets and griddles that have a handle (the separate No.4 size is a different SKU). Not for oven use. Specs from Field Company's Leather Handle Cover page.
The brown Standard cover. Slide it on the handle when the pan is hot.