Waterproof Protection - TPU membrane coating on the reverse side of the top layer effectively repels liquids, preventing any penetration to keep the mattress clean and dry. Soft & Breathable - Ultra-soft bamboo viscose jersey surface boasts moisture-wicking properties, cooler than other fabric. It is thin to retain the original feel of the mattress, ensuring a flawless sleeping experience. Adjustable Bed Friendly - Fits the mattress snugly, staying in place when the mattress is adjusted. there is no padding or quilting, preserving the mattress's original feel while protecting it. Durable & Easy to Clean - Machine washable in cold water and tumble dry on low heat. Size Information - Partial Split Top King size features a 32-34 inch split from head and overall dimensions of 78x80 inches. With a fitted sheet design and stretchable deep pocket, it accommodates mattresses with up to 18 inches thick perfectly.