Braiding hair can be used to easily create straight styles without the need for you to use any heat. No worries about heat damage when you use this alternative to the flat iron or chemicals.
You have two methods to implement: do a simple style like a ponytail or a longer term style like crochet braids.
I had some fun and did two ponytails for this look and was really impressed. You can wear this hair as is (it almost looks like bundles!) or braid it up.