Silicone TOTAL PROTECTION: This waterproof mattress protector protects all sides of your mattress from liquid and dirt QUIET AND SOFT: The thin, skin friendly fabric is quiet, smooth and breathable and will not change the feel of your mattress SNUG FIT DESIGN: Deep pocket design fits mattresses 6 to 18 inches deep while a bottom elastic creates a smooth, secure fit to give you a secure mattress cover STRATOSMART BARRIER: 100 % waterproof cover shields from all liquids and a watertight zipper keeps the protector securely in place 15 YEAR WARRANTY: Ensures you can protect your mattress investment for many years