The reason is simple: to beat the September heat in Santa Clara.
"I unfortunately had to decide that back in April this year because last year, we had a heat wave when we played them (the Cardinals)," head coach Kyle Shanahan explained during a recent radio interview.
Shanahan, who began his NFL coaching career as an assistant with the Tampa Bay Buccaneers, said he learned early on the value of wearing lighter-colored jerseys in hot weather—especially when it forces the visiting team to wear darker uniforms.
"I thought it was a huge advantage for us," Shanahan said. "I can always feel that disadvantage when you go to places like Miami and stuff. Never thought about it out here. I never thought it got too hot, but it was that one day, and we knew it was going to be. So, we asked the NFL if we could wear our whites [last year], and they said you had to decide on that before the season started."
The game Shanahan referenced was the 49ers' 24-23 Week 5 loss to the Cardinals last season, which kicked off in 89-degree heat at Levi's Stadium.
"And so, I did think that could have been an advantage that we weren't able to take advantage of," Shanahan continued. "So I had to decide in April, and I tried to look at the weather, and they didn't have it yet [laughs]. So I just went with the percentages. Well, hey, it might be hot, so we'll do white for the first two home games."
Shanahan added that while the NFL allows for last-minute uniform changes if both teams agree, no opponent is likely to forfeit the advantage of seeing the home team sweat it out in darker jerseys.
More San Francisco 49ers News
-
Why the 49ers have no quarterback debate
Monday night, as I was about to order my Panda Express dinner before the game, the man in front of me asked if I thought quarterback Brock Purdy was good and how he compared to Mac Jones. He was a Patriots fan who felt Mac had gotten a raw deal in New England, but I told him... -
Why the 49ers can't underestimate Philip Rivers in clash with Colts
The San Francisco 49ers defense will face Philip Rivers on Monday night. The 44-year-old recently came out of retirement to sign with the Indianapolis Colts following Daniel Jones' season-ending injury. The 49ers know Rivers well. Head coach Kyle Shanahan and the front office... -
49ers mailbag: What's up with Jordan Elliott's knee? Can SF stop Jonathan Taylor? What's on the 49ers' list for Santa?
The San Francisco 49ers are gearing up for the final push toward the 2025 postseason. How far they will be able to go will depend on their health and how many young players perform. Especially since some are reserves who are playing for injured players. We opened the 49ers... -
49ers vs. Bears injury update: George Kittle remains a game-day decision
San Francisco 49ers tight end George Kittle did not practice this week as the team prepares for its Week 17 matchup against the Chicago Bears, leaving his status up in the air heading into Sunday. Despite the lack of on-field work, the 49ers remain optimistic that the All-Pro...