• Thinner Shells: Because the crab just molted, the new shell is larger, thinner, and less dense. • Air Pockets: The meat inside has not fully filled out the shell yet, leaving empty space or air pockets. • The Float: When boiled, these empty spaces and thin shells cause the claws to float to the top of the pot. • Easier to Crack: The shells are softer and more brittle, meaning you can often crack them open easily without heavy-duty tools.