A few weeks ago I purchased a CK shirt from Macy's (this one), my first not 100% cotton shirt in over 10 years. The shirt is 97% cotton and 3% lastol, a synthetic fiber produced by Dow Chemical. Lastol is more abrasion resistant than cotton. I have to throw away shirts after 6 months maximum because a hole develops on the left elbow. Anyways, back to the shirt, I see 3 differences compared with 100% cotton: It has a nice sheen -- ok for a white shirt but I'm not sure I would like it for a colored shirt. It is much softer than pure cotton. It is not snow white like a cotton shirt is, more like a pearl color. The shirt itself is quite nice, no front pocket, and no placket seam. Has anyone else bought something with lastol in it?