I don't know what this material is but it feel so good. I LOVE this outfit to the point I've ordered a second one in another color. It's so soft and clings in just the right way. I wore it all day running errands and house chores. It looks great, emphasizes my curves and small waist. I will say the pants seem to rub big but the top small which is saying something because I am more pear shaped right now and usually it's the opposite for me. The only thing I'm missing is pockets on the legs of the pants, several times I went to put my phone in the pocket like in all my other leggings and was disappointed. I will say though the pockets in the jacket were big enough my phone didn't pop out which often happens in the small pockets of jackets in this style.