Enhance your comfort with 4 inches of luxurious down alternative fill. Designed with four heavy-duty elastic corner straps to easily and securely attach to any mattress, this topper will quickly add softness and enhance the comfort of your bed. In addition, the mattress topper has added non-slip details on the bottom of the mattress, so that it does not slide easily and can be more firmly fixed on the mattress. 4'inches down alternative topper promotes a cooler sleep experience and pressure relieving, which helps you fall asleep faster and stay asleep longer.