It is important to consider your use of the hammock when deciding on a sleeping pad. If you camp mostly during summer a basic air filled sleeping pad is perfect, and can be found at affordable pricing. For year round camping we recommended that you use a well insulated sleeping pad.
R-value (putting a number on warmth): Most manufactures of sleeping pads meant for camping provide an R-value. This describes the pad's insulation ability and a higher R-value means better insulation ability. For winter use it is preferable to have an R-value of about 4 and more. For 3-season use in spring, summer and autumn an R-value around 3 will do. For camping in the summer and in warmer climates you can use an air filled mattress without insulation.
Bring a repair kit
Always remember to bring a repair kit in your backpack. Most manufacturers include a repair kit when you purchase a pad.