Smooth, comfortable cotton lawn. Tightly woven and strong, it's light enough for summer, but great for winter as well. True to size for a nightgown (a tiny bit of roominess built in for comfortable movement) and durable, with tightly stitched seams. I really like the fit in the underarm area,  not too loose or tight. Beautifully pintucked, comfortable all purpose nightgown. I noticed little or no shrinkage despite a very warm water wash.  My new favorite nightgown.