Ceramic curling irons distribute heat evenly for smooth, shiny curls and are gentler on fine or fragile hair, says celebrity hairstylist Joseph Maine. Creates tight ringlets or corkscrew curls that are best for short to medium hair 1 inch: The most versatile size for most lengths, since it can make everything from bouncy curls to soft waves The most versatile size for most lengths, since it can make everything from bouncy curls to soft waves 1¼ inches: Great for medium to long hair and loose, glam curls