Classic Certified Heat-Sealed Liner $ 19.95 XS - $ 19.95 S - $ 19.95 M - $ 19.95 L - $ 19.95 XL - $ 19.95 XXL - $ 19.95 Quantity This product is currently out of stock. Please fill in the form below if you'd like to be notified when it becomes available. Classic Certified Heat-Sealed Liner. These are the Liner kits to replace those that came in your Classic Cert, Classic Snow, & Old School Cert.