The San Francisco 49ers 2025 Rivalries Collection Sideline Velocity Dri-FIT T-Shirt from Nike is an ode to a fanbase that moves more like family. An all-black cross-dyed pattern and saloon-style wordmark with gold accents represent the franchise's rich history. Lightweight polyester combined with sweat-wicking technology helps keep you cool and dry in this exclusive For The Faithful shirt.