They're designed to keep you.

Choose Your Fabric Finish: 3D Black Mesh
Custom Bundle: No
Main Colour: Black
Body Part: Back
Material: Memory Foam, Polyester
Modified Item: No
Colour: Black
Brand: Great Ideas
Sub-Type: Back Support / Height Booster Cushion
Type: Back Cushion
Other Body Parts: Thighs and Legs
Unit Type: Unit
Manufacturer Warranty: 1 Year
Features: Anti-Decubitus, Arch Support, Ergonomic, Hypoallergenic, Latex-Free, Lightweight, Machine Washable, Memory Foam
Unit Quantity: 1