Pack ice

pack ice"(Also called ice pack.) All sea ice other than fast ice; thus, sea ice that is capable of substantial motion and deformation.

Pack ice
Sea water which freezes and forms into large floes. Also known as sea ice, it is different from icebergs.
Peak Hmax ...

Floe Separate patch of floating ice or flat sheet of unbroken pack ice, greater than 20 m across.