The helmet is one of the central parts of the soldier equipment and is used by the absolute majority of soldiers. Its main purpose is to protect against penetrating fragments and projectiles as well as blunt impacts, although comfort and stability are important properties as well. The large number of individuals that are supposed to use the helmet means that the helmet must be adjustable to variations in both head form and diversity in tasks. When replacing the old soldier helmet Hjälm 90 with a modern helmet it will be possible to improve ballistic performance, comfort and stability at the same time. As input to the technical requirements for a future acquisition of a new ballistic helmet, FOI has, on behalf of FMV, performed a number of studies on protective performance of the next-generation soldier helmets. Based on the results from these studies it is recommended that the next-generation soldier helmet is specified primarily for the key purpose of protection with a high ballistic performance and as large as possible area of coverage. Protection against blunt trauma should be specified for all directions of the helmet not only from the top, as is done in the industry helmet standard EN 397. Generally, the technological development in soldier helmets, concerning both ballistic shells and retention/suspension systems, has progressed rapidly during the last years, and therefore, a new request for information (RFI) should be performed before the technical requirements are finalized.