The Detroit Lions used the NFL Rivalries program to put a home-field idea on a jersey: Defend the Den. The body is white. Honolulu Blue and black do the attacking work around it.
In photos the white can read silver or light gray, especially under studio light and next to the carbon-fiber / paint-stripe details. On the garment, it is a white Rivalries jersey with blue and black trim.
White body, blue and black edges
Shoulder and stripe work pair Honolulu Blue with black. Official language compares those darker hits to a lion locking onto prey. The jersey stays in the Lions palette, but it looks harder than a standard white road top.
DETROIT across the chest
DETROIT sits on the chest in blue. The Rivalries jersey does not invent a new crest. It puts the city on the front and ties the look back to the Lions' existing identity.
Italic numbers and paint-stripe details
Numbers are italicized black with a Honolulu Blue outline, leaning forward for speed. Paint-stripe details run through the jersey and connect the white field to the blue-and-black trim. The texture is closer to factory paint and racing marks than to a standard NFL sleeve bar.
The collar carries the theme
Inside the collar: "Defend the Den." Ford Field is the den. Every opponent is treated as an intruder. That is the brief for the jersey.
Why the concept holds
Detroit did not make a blue alternate and call it Rivalries. It made a white jersey about home turf: city name on the chest, Defend the Den at the collar, italic numbers, and blue-black paint-stripe details.