What is one reason so many pinnipeds look like chubby cigars?

Many pinnipeds, such as seals and sea lions, have a streamlined, blubbery body shape that resembles chubby cigars primarily due to their adaptation to aquatic life. This fat, or blubber, serves as insulation in cold ocean waters, provides buoyancy, and acts as an energy reserve during fasting periods. Their unique body shape enhances their ability to swim efficiently, allowing them to chase prey and evade predators. Additionally, this morphology helps them maintain stability and maneuverability in the water.