Cotton, cotton, love cotton!
I love this sweater.  i am 5' 1" and tried on the petite in the store but ended up going with the regular size as i preferred the length.  the overall fit was the same.  i bought the blue which to me is the colour shown here, more a grey and purplish colour, beautiful for fall and much nicer than a straight blue.  i have worn it to work several times and always get a compliment.  this sweater is nice for all ages, it is soft, comfortable and versatile.  it might just be my go to fall sweater.