The fin breaks the surface first — a single dorsal, clean and unmistakable, moving north through the channel past Fort Hancock on an October morning. Porpoises push through the lower harbor all fall, riding the current between the Verrazzano Narrows and the open Atlantic. You see them from the bluff, from the beach, from the ferry if you're watching. They don't announce themselves. They just are.

The peninsula has always been a threshold. Giovanni da Verrazzano anchored here in 1524 and called the harbor a refuge. The Sandy Hook Lighthouse has been burning since 1764, guiding ships past the shoals. The Life-Saving Service kept watch from the dunes. All of it — the fortifications, the lighthouses, the lookouts — built to read the waterline, to know what's coming.

This crewneck carries the mark of that dorsal fin and the single word. Not branded across the chest — just left of center, where a patch would sit on a work shirt or a service jacket. Heavyweight cotton fleece, ribbed cuffs, the kind of thing that holds up to wind and salt air and repeated wear.

It's what you pull on when the light goes low and the nor'easter starts to build. When you're walking the Hook at dusk or standing outside the Twin Lights with your hands in your pockets. A sign you know the place. A sign the place knows you.