The San Francisco 49ers are one of those teams with a strange name. If you don't know your history, the 49ers sounds like one of the weirdest names for a football team. The name refers to the gold rushers in 1849 who rushed to California in search of gold. It is a reminder of an important part of California's history, hence the gold color that is so important to the team's colors.
The two designs on the right side really push the gold design for the team, which is an awesome direction to go. The 49ers are all about gold, so the more we can see that in their design, the better. That being said, the helmet design in the bottom right lacks gold, but the deep red is visually striking, if not a little boring.