The Serenity by Tempur-Pedic 3-Inch Memory Foam Mattress Topper transforms any existing mattress into a deeply supportive and comfortable sleep surface. Featuring 3 inches of proprietary TEMPUR Material — originally formulated to absorb the G-forces experienced by NASA astronauts and then refined for sleepers — this topper continuously adapts to your weight, shape, and temperature to alleviate pressure points that cause tossing and turning, delivering a medium feel ideal for a wide range of sleep styles.

The topper includes a breathable performance cover crafted from a polyester blend stretch-knit fabric, engineered for temperature regulation and enhanced air circulation. The cover is removable and fully machine washable and dryable, making upkeep simple. An elasticized stretch-knit skirt ensures a secure fit on any mattress up to 17 inches deep. The king size measures 76 inches wide by 80 inches long, fitting a standard king bed.

Hypoallergenic and designed and assembled in the USA, this topper is rated 4.2 out of 5 stars by over 1,700 Costco members and is frequently praised for relieving chronic back, shoulder, and joint discomfort. It is an effective, cost-efficient alternative to replacing an entire mattress.