Yeah, forgot to mention hammocks do eliminate the need for padding under you for comfort, but do NOT eliminate the need for insulation under you! In temperatures of 70 or above, most people can sleep with no insulation underneath but beyond that you need to either use a pad, or a hammock-specific "underquilt." Lots of these quilts are made by cottage manufacturers. A pad isn't as comfy, but a UQ is more expensive - but the ultimate in comfort from what I've heard (don't have one yet myself). You can use any pad you would use sleeping on the ground, but keep in mind you'll probably want it to be wider: you need something to insulate your shoulders and other wide body parts that press against the side of your hammock, thus compressing your sleeping bag. A 24" wide pad is said to work for almost everyone. Some hammocks have a double layer allowing you to slide a pad in between the layers, but you can also just put it directly under you.