Acetamidoethoxyethanol

goodie
Also-called-like-this: ElfaMoist AC
What-it-does: moisturizer/humectant

A  high-performance moisturizer that's claimed to give both amazing instant and longer term (up to 30 hours) hydration to the skin. It works through interacting with water and keratin (skin protein) to keep the water molecules tightly bound in the upper layer of the skin. This binding mechanism supposedly ensures that Acetamidoethoxyethanol gives great hydration initially as well as over 30 hours. 

It's also non-sticky, spreads nicely and easily on the skin and plays well with other common ingredients in the formula.