Interplanetary observations of the solar wind in the ecliptic plane have shown that the "steady" (nontransient) solar wind is not uniform or constant but varies in many respects from time to time and from one place to another. In particular, it has been observed that some properties of the solar wind depend on its velocity regime, being clearly different for fast and slow winds. The high-speed wind (u ≥ 650 km s-1) is characterized by a high temperature, a low density, and a low mass flux, while the low-speed wind (u ≤ 400 km s-1) is cooler, denser, and has a larger mass flux. Other differences, such as composition, Alfvén wave content, anisotropies in proton and electron temperatures, etc., have also been observed between slow and fast solar winds. All these differences, together with the fact that a sharp transition between the two types of wind was usually observed by Helios in the inner heliosphere, have led to the proposal that slow and fast solar winds have different sources at the Sun (e.g., Schwenn, Mülhauser, & Rosenbauer 1981). There is general agreement that high-speed wind originates in coronal holes, which are highly diverging coronal structures of lower density and temperature than their surroundings, structures where the magnetic field lines are open to the interplanetary medium (e.g., Zirker 1977). Great effort has been made to model the steady high-speed wind from holes, emphasizing the role of Alfvén waves in the achievement of high speed and other characteristics of the fast wind (see, for instance, the review by Marsch 1994). Such models have reached a high degree of sophistication, including multispecies treatments as well as strong heating in the low corona to achieve rapid acceleration of the wind, etc. (McKenzie, Banaszkiewicze, & Axford 1995; Esser & Habbal 1996). However, the origin of the low-speed wind is less clear. It has been associated with the more active coronal regions and their mainly closed magnetic structures (Schwenn 1983), but no formal model for slow wind from these regions exists.