LEAVE-IN ANTI-FRIZZ DEFINING CRÈME FOR CURLY AND COILY HAIR This is one killer anti-frizz curl definer that will put the spring back into sad, straggly curls. KILLER.CURLS, our antioxidant rich, leave-in anti-frizz defining crème, helps to activate curls while adding essential moisture to throw out the frizz. Curls look and feel natural and soft, as KILLER.CURLS delivers the ideal balance of strong hold and elasticity to the hair.