volume but not great for curls or waves [SEP] not for me or for anyone with waves and curls the brush is unable to straighten close to your scalp line which is a problem for those of us with curly or wavy hairhowever i did notice some extra volume from using the brush and i do not think it was as harsh on my hair as a regular straightener isbut because of my own hair type i do not think it is for me but would be great for anyone with slight waves or straighter hair