What tool is commonly used for layering hair?

Thinning shears are commonly used for layering hair because they have a unique design that allows for the removal of bulk from the hair without drastically altering the overall length. They feature one blade with teeth that cuts only a portion of the hair strands, giving a textured finish and creating layers that blend seamlessly. This technique can help to enhance movement and volume, making it ideal for various hair types and styles.

Unlike clippers, which are typically used for cutting hair to a uniform length or for creating short hairstyles, thinning shears offer a more delicate approach to layering. A hair straightener is designed for smoothing and straightening hair rather than cutting or layering, and a round brush is primarily a styling tool used to create volume and curls during blow drying, rather than for cutting or layering purposes. Hence, thinning shears are the appropriate tool for achieving layered hairstyles effectively.