Back Sleeper/Medium Body Type Pillow The Lightning performance pillow provides the perfect cushion for your shoulders if you rest them on your pillow when you sleep. The unique dual chamber construction features a React® foam crown and React foam blend which contours to your body, eliminating pillow bounce to improve deep sleep. The Storm Series features Ver-Tex® 6.0 Climate Control Fabric which provides a cool to touch feeling and continuous heat deflection, regulating your body temperature for a cooler nights rest. The Air-X® ventilated panels increase airflow and feature a filter fabric which prevents allergens and dander from entering the pillow core.