Elasticized construction, works like fitted sheet. Custom made to fit any round, oval, square, T shaped, or L shaped cushion these slipcovers are the perfect solution for all seat cushions including, moon chair cushions, seat cushions , or pet bed cushions. Since each piece of furniture has its own unique dimensions we offer a comprehensive easy to follow “measuring guide system” so you can rest assured knowing that your new custom elasticized slipcover will fit your furniture cushion just right.