Air springs (bags, sleeves, bellows, or pneumatic springs) include tapered, rolling lobe, and reversible sleeve types—most common in OEMs for smooth, tunable ride—and convoluted designs with 1–4+ convolutions for higher load, stiffness, and travel. Nylon or Kevlar cording comes cordless, parallel, or cross-corded for durability. Bump stops ease full jounce and limit height if the sleeve ruptures. Pistons adjust air volume inside the spring to dynamically tune the spring rate.

Active air springs incorporate multiple chambers with valves to control the springs' internal volume for roll and pitch.