Medline Gel/Foam Overlay: Provides Excellent Pressure Reduction And Comfort For Patients Who Need It Most. Completely Antimicrobial Nylex Top Cover And High-Density Foam Surround A Layer Of Super-Conforming Gel. Bottom Cover Is Skid-Resistant Vinyl. Three Separate Gel Packs At Foot, Middle Torso And Upper Torso Prevent Gel From Pooling If Head Of Bed Is Raised. Fluid-Proof Cover Is Finished With Inverted Side Seams To Help Prevent Fluid Penetration. Four Elastic Bands Secure Corners Of Overlay To The Mattress. Standard Size Is 34" X 76" X 3 1/2". Custom Sizes Are Available. 34" X 76" X 3.5".