KeraCare® Thermal Wonder™ is free of straightening chemicals and does not alter your curl pattern. Your hair will revert back to its normal curl pattern as soon as you shampoo it or are exposed to water, sweat or prolonged excessive moisture. You have the flexibility to wear a straight style one week and curly after shampooing. Be mindful however that frequent heat styling week-after-week can loosen your curl pattern and straighten the ends.