Buy Hip and Ridge Shingles and ship them directly to your roof project address. The parts of the roof called hips and ridges are vulnerable to hail and wind, and they require special shingles called Hip and Ridge Shingles. The field asphalt shingles cannot be used on hips and ridges of the roof because hips and ridges are bent (not flat like the field area). Also, hip and ridge shingles are measured in linear feet, not square feet like the field shingles.