In 2002, the Swedish Navy ordered an additional 27 boats of a slightly different type, designated Stridsbåt 90 HS - where S refers to "Skydd" ("protected") as the Strb 90 HS is armoured and features CBRN protection (the whole boat can be over-pressurized) - intended for use in international peace-keeping operations. Apart from the addition of armour, it sports air-conditioning for deployment in tropical conditions, fuel cooling system, 220 V generator and more powerful engines. The manufacturer sometimes refers to the model as the "CB 90 HI", where the I probably stands for International.