PH Collection believes your purchase is very important. We want to help you choose the right hair extension length. The length of hair depends on the texture you choose. PH Collection Straight human hair is longer because it lays completely flat when it's measured. The length of PH Collection curly and wavy hair appears shorter because of the curl pattern and full volume of the hair. When the hair extension is straight, the length will visibly look the same as the straight human hair. Use the chart above to guide you on selecting the desired length.