Stop sleeping on wrinkled, baggy cotton. We engineered the AeroFlex Pillow Case with a proprietary 4-fiber blend that combines the softness of luxury bedding with the fit of high-performance activewear. Why it feels different: ☁️ The Perfect "Snap" Fit: Thanks to 6% Spandex, this case stretches to custom-mold around the unique curves of your Onyx pillow. No bunching, no wrinkles, just a smooth surface every time. ❄️ Zero-Heat Retention: We blended 24.3% Beechwood Modal with premium Cotton. This combination is 50% more absorbent than cotton alone, pulling sweat away from your skin instantly so the "cool side" of the pillow is every side. ✨ Hotel-Grade Smoothness: The Modal fiber provides a silky, high-end glide that reduces friction on your hair and skin, preventing sleep lines and morning frizz. The Fabric Specs: Feel: Silky-smooth, cool-to-the-touch, slight stretch.Fit: Taut, wrinkle-free, contour-hugging. Product Details: Certifications: OEKO-TEX® Standard 100 (Safe from harmful substances)Care: Machine wash cold, tumble dry low.Compatibility: Designed exclusively for the Onyx Aeromatrix™ Pillow.