Organic cotton, linen, silk — natural fibers are often soft, breathable, and less hospitable to dust mites and mold.[1] Cotton, specifically, absorbs moisture well and resists allergen collection.[1] Linen and silk also show properties that help reduce mite presence.[1]
On the flip side, synthetic fibers like microfiber and treated polyester block allergens even more vigorously. Their dense weaves physically prevent allergen penetration.[1] Some synthetics, especially microfiber, resist mold and mildew and are easier to clean.[5]
Even with hypoallergenic sheets, bedding still traps allergens at the source, especially within mattresses and pillows. That’s where encasing covers come into play. Clinical studies show that covers made from tightly woven or impermeable fabrics significantly reduce dust-mite allergens, sometimes cutting levels to less than one-third in a year.[2][3]
Studies confirm that fabrics with pore sizes under 10 µm block mite allergens, and even cat allergen if under 6 µm.[7] While impermeable plastic-like covers work best in lab tests, breathable woven and nonwoven encasements provide an optimal balance of allergen blocking, airflow, and comfort.[3][7]
