A too-high heat, like 450 degrees, can damage the hair strand’s internal structure; the lowest setting damages the hair’s cuticle layer without creating a long-lasting style. GHD has found the perfect compromise. “Think of 365 as the sweet spot, the perfect in-between for the longest-lasting results with no extreme heat damage,” Kirkland says. GHD further stands behind its researched 365-degree set point with what it calls HD Motion-Responsive technology, a new mechanism contained in both the original Chronos and the Chronos Max. Motion-Responsive technology compensates for the temperature drop that occurs when heat transfers from the straightener to the hair itself, which is a phenomenon that GHD calls thermal lag. Kirkland illustrates this by miming using a flat iron on a section of her hair. “As [the straightener] glides down the strand, it may be 430, then 420 … it’s not consistent,” she says. “Our technology has the ability to immediately recuperate from the temp drop with sensors that measure the entire plate surface 250 times a second, to ensure that every single part of …