The yarns showcased here are generally classified as bulky weight. Bulky yarn works up quickly using large needles or hooks, wonderful for when you need a quick scarf or hat. It also makes a fast, squishy afghan or sweater.
Remember that some yarns don't fall neatly into a category, so some categorized as slightly smaller or slightly larger may also meet your needs! Want more information about yarn weights? Check out this page from the Craft Yarn Council!