Like other seals, the vascular system of elephant seals is adapted to the cold; a mixture of small veins surround arteries, capturing heat from them. (en.wikipedia.org)
They have a prominent mid vein and smaller veins at right angles to it that extend to almost the leaf margin. (AmbergrisCaye.com)
The blood collects and flows in small veins in the extremities. (compressioncarl.com)