Our 100% soft cotton jersey sheets are perfect for portable crib/Pack’N Play. Easy to place and remove from the portable mattress. Our patented envelop sheet design wraps under the mattress and prevent the sheet from slipping off the bed. The stays on corners are designed with extra deep sides that will fit your mattress securely. All Sheets are washer and dryer friendly and are sized to allow for shrinkage. Dimensions: 30″ x 40″.