Sunny Hair only provide 100% human hair,which can be easily styled to your hair. Silky soft and extreme smooth,the hair can be straightened, curled, and styled as you desire. If you 'd like the freedom to apply your hair extensions in whichever way you like,Sunny Weft Hair is your best choice.After washing,silky straight hair would be a little wavy, not so smooth as previous. It's normal.Please maintain the hair with conditioner, and you could also straighten or curl the hair extensions as your own hair. But do not use heating tool frequently,which would shorten lifespan. Hair length is defined as the hair is stretched in straight condtion. Don't expose the hair to the salty water for a long time.Use a covered band and place the long extensions in a braid, when you do exercise or sleep.