10 Best Hair Straighteners and Flatirons for Smooth, Damage-Free Strands

At Glamour we’ve been testing the best hair straighteners for more than three years. While spec sheets and reviews are a crucial component of our research, we believe it’s important to put hair tools like flatirons to the test for practical feedback. That’s why we sent more than 20 of the top-rated and most well-reviewed options to team members to assess both performance and long-term durability.

During evaluations we looked for a variety of qualities like plate material, temperature range, ease of use, and overall performance, plus convenience features like an auto shutoff (more on this below). We also considered how durable the tools were over time. Most important, our top hair straighteners had to deliver sleek and shiny results that lasted throughout the day—and, ideally, beyond.

Nearly a year later, and we’re on our third round of testing. We’ve sent new picks to more testers, plus asked previous contributors to reevaluate each straightener. How well did each product hold up throughout continued use? Did our testers still stand behind their picks—why or why not?

Note: Although we might receive gifted products, our recommendations come from months of testing and evaluating the very best products. We maintain complete editorial independence in the products we choose to feature. We do not benefit financially from including any of the products, except from purchases of products through our links.