Hookless shower curtain innovative replacement liners snap directly to the curtain below the sheer window for a cleaner appearance and easy removal for cleaning. Traditional liners require double hooking with the shower curtain along the rod, a high, cumbersome process that leads to sagging material, snags and tears. For use with Hookless curtains with a window The It's A Snap curtain liner is specially designed to quickly and easily snap in and out of Hookless curtains to streamline installation and cleaning. For use with Hookless curtains.