22" Straight Hair Extension by Hairdo is a multi-level, one piece, clip-in extension. Short hair becomes long and luxurious. Long hair becomes thick and full. These hair extensions are made with Tru2Life heat-friendly synthetic hair that can be flat-ironed, curled or blown out. What's totally trending? Smooth, slick and super straight. DIY sleek. Runway ready. It's easy to transform hair, making it look longer and lusher with this 22" clip-in hair extension.