Made from Pristine fabric from USA with 2 patents (6,277,770 & 7,290,381). Tight woven construction with average pore size smaller than 6 micron which blocks dust mites & allergens, but allowing moisture & air to pass thru. No chemical nor urethane membrane (Confidence in Textiles - Tested for harmful substances according to Oeko-Tex Standard 100). Very breathable: permeable to air & water vapor (MVTR ~1300). Fabric has over 240 threads stitched/ inch with soft hand feel. Durable and can be frequently washed with hot water at 55C. Combo set: 1ea mattress protector + 1ea pillow case