Small barrel curling irons (1/2- to 1-inch diameter) are perfect for short hair and creating tighter curls. They’re also great for creating beachy waves in medium length hair that needs more texture.
Medium barrel curling irons (1.5-inch) create medium-sized curls and waves. This size is perfect for creating a full curl in shoulder-length hair, and for creating loose curls and waves on longer hair.
Large barrel curling irons (2-inch) are for those who want voluminous curls and waves. This size is perfect for adding volume to long hair as it creates a big, full curl. It’s also great for creating beachy waves on shorter hair.