Paul Mitchell Round Trip Curl Defining Serum - 200ml Ideal for Wavy and Curly Hair. This liquid curl definer is designed to enhance waves and curls with weightless bounce and definition while significantly reducing drying time. Formulated with panthenol and minerals, it conditions, protects, and strengthens wavy and curly hair. Offering flexible hold, it leaves your curls looking vibrant and feeling soft, helping you save time while achieving beautifully styled hair. Use Apply a small amount to clean, damp hair. Style as desired. Pro Tip: Apply to damp hair to define waves or curls.