Just before each spring training, Jacob deGrom has his hair cut in the kitchen of his parents’ house in DeLand, Fla. His older sister, Jessica, a former hairdresser, styles it. The whole scene has become something of an event for the deGroms. They find it funny to watch a major league pitcher squirm.

“He’s a fidgety one,” Jessica said. “He’s just ready for it to get over.”

Before it is over, though, deGrom checks to see how he looks with a hat on. Not because he is worried about being noticed and mobbed off the field; he simply wants to keep his hair out of his face. At times, it drives him crazy. When he tosses and turns too much in his sleep, his hair wakes him. On the mound, he often has to brush away loose strands. Without a hat, it can be unruly.

Sometimes — take a deep breath, Mets fans — he fantasizes about cutting it all off.

“I might cut it at the end of the year,” he said recently.

This is a bigger decision for the 27-year-old deGrom than for a lot of other people because he has now established himself as one of the best pitchers in baseball. His profile is growing exponentially, and the long, thick hair that grazes his shoulders has become his identifiable — and marketable — signature.