Viewers immediately noticed that David Harbour’s character Floyd had a gut when DTF St. Louis debuted on HBO in early March 2026. a genuine, noticeable, shirt-straining belly that appeared to be completely at odds with the body Harbour had meticulously preserved throughout his subsequent Stranger Things seasons. In a matter of days, questions about whether or not David Harbour gained weight for DTF, as well as how much and how quickly, began to circulate on Reddit and social media.
The response proved to be more bizarre than most people had anticipated. Harbour, who is now fifty, did not put on weight for the part. He had a prosthetic on.
On the surface, this detail may seem insignificant, but it reveals something about his decision-making process. For a character characterized by middle-aged self-consciousness and a complex relationship with food, the production had asked him to gain eleven pounds, which was not a dramatic request. Harbour fell. On Late Night with Seth Meyers, he said, “I have to be ripped.” He grinned as he said it, but the reasoning behind it was sincere: he had decided that specific treadmill was no longer worth using after years of cycling his body weight up and down for different roles.
Instead, the team fitted him with a 30-pound, specially designed latex prosthetic vest that encircled his love handles and midsection. Harbour could easily zip up a padded suit and take it off over lunch in scenes where Floyd kept his shirt on. However, the entire prosthetic had to be adhered to his skin using spirit gum for any shirtless moments, which Floyd has a surprisingly high number of, given his character’s self-consciousness. Each morning, that procedure alone took about an hour. Every day, a new prosthetic was made from latex. The entire thing had to be peeled off after a 14-hour shooting day. In a memorable description, Harbour said that he came away “all sweaty.”
Interestingly, Harbour isn’t totally certain that the prosthetic was required. He said, half-laughing, “I don’t know that I really needed it,” to TV Insider. His natural build appeared to be sufficiently similar to Floyd’s appearance, especially after the weight swings of recent years, that a little actual bulking might have produced a similar outcome. However, he discovered a benefit to the prosthetic that went beyond its aesthetic appeal. “There’s something about having a mask,” he said, “that allows you a freedom.” That feeling of wearing something, of being hidden behind a layer, might have enabled Harbour to discover the character’s interiority in a way that unadulterated physical change couldn’t for a character as self-conscious and emotionally confused as Floyd.
At this point, Harbour’s history with body transformation is widely known. During the filming of Stranger Things Season 4 and Black Widow, he famously lost about 80 pounds, mostly through intermittent fasting. He then recovered the majority of it for Violent Night, where he portrayed a violent, inebriated Santa Claus. He had lost weight by the time he rejoined Thunderbolts as Red Guardian. He appears to have consciously broken free from this cycle by prioritizing craft over bodily sacrifice.
In many respects, Floyd in DTF St. Louis is a character centered around his body; he is conscious of his appearance and how others perceive him, and he uses food, desire, and midlife restlessness as a kind of armor. The performance beneath it was successful, regardless of whether viewers saw the prosthetic or took the belly to be real. Perhaps the most honest aspect of all of this is that, in Harbour’s opinion, the artificial stomach served a genuine purpose for the character.
