Primarily the sleeping pads for hammock can be divided into three broad types -Namely the air pads, closed-cell foam pads, and self-inflating pads. Whereas closed cells are most basic and inexpensive and highly durable, air pads are inflatable pads, like those floats in a swimming pool. They provide good insulation, are extremely light-weight and comfortable. Self-inflating pads are a hybrid of air pads and closed-cell pads. They are well insulated, inflate themselves, adjustable to your need, but heavier and slightly less easy to pack.