not flat iron straight [SEP] it s at most ok but don t expect results the picture of the advertisement because at best this will give you blow dry smooth result i have combo hair so at best the results fell short of the pictured smoothness advertised but i can t complain as far as price since i did get this on a lightning deal i have found a great use for this so all is not lost because i use this to loosen my curls prior to flat ironing which helps cut down time since i air dry my hair and i also use this to refresh my hair in the morning so all in all this will not give you smooth flat iron straight hair but it works great as a supplement along side a flat iron