Viking Tactics Cobra Belt. When buying a Viking Tactics Cobra Belt belt, it is important to select the correct size based upon an accurate measurement. Your belt size is not the same as your pant or waist size; because your belt goes around you and your pants, your tucked in shirt, and your underwear, your belt size is usually 1 or 2 inches larger than you pant or waist size. The leading manufacturers of quality belts share the same standard for measuring and labeling belt sizes. This measure is based upon the length of the belt strap only, and does not include the buckle.