I tried their keratin bonded hair (installed by a professional) after loving their double wefted clip-in extensions. Wow! They are amazing. I had them installed about 4 weeks ago and not only do they look fabulous they are not wavy (like some cheap hair looks like after washing) or thining. I would HIGHLY recommend these - so would my professional installer. When I eventually need a new set, I will certainly re-order from here. Two giant thumbs up!