DetailsAll Hair Extensions Defined products can be washed, conditioned, cut, and colored. Tight Curl is for those who want tight curls without the kinky texture. Tight Curl is silky, looks very natural, and will blend well with your own hair texture. We do not recommend straightening Tight Curl with a flat iron, as it may not go back to its original, curly state. Straightening Tight Curl may destroy the curl pattern.