A forward sale is an order that reserves coffee for release at a determined delivery period in the future. Forward sales can be either fixed or unfixed.
A fixed sale is comprised of an agreed-upon differential added to the current level of the C-market for the corresponding trading period. An unfixed sale is comprised of an agreed-upon differential that will be added to a level of the C-Market of the corresponding trading period at a time of your choosing (before first notice day of that trading period).
Both options give a buyer the ability to secure coffee types and market levels in advance.