Personalized | Proud Flag Football Sister Shirt | Flag Football Shirt for Sister | Custom Name and Number Shirt

Her Biggest Cheerleader, Her Forever Friend

She is the one who knows every play, every victory dance, and every inside joke from the sideline. She is the teammate for life—the one who celebrates the wins, lifts spirits after the losses, and never misses a chance to show her support. Celebrate the sister who brings the energy and the heart with the Proud Flag Football Sister Tee—a design as vibrant and unstoppable as she is.

This shirt features a stunning floral border intertwined with the thrill of the game, creating a look that is equal parts feminine and fierce. The front makes a bold, loving statement: Proud Flag Football Sister, a title that speaks to the unbreakable bond only siblings share. The true personalized touch lies on the back, where you can customize the shirt with your athlete's last name and jersey number, turning this tee into a treasured keepsake she will wear with pride season after season.

Premium Comfort for Game Day and Every Day

We know that Flag Football requires movement, breathability, and comfort. That's why we print exclusively on the highest quality t-shirts in the industry, ensuring she looks as polished at the final whistle as she did at the opening snap.

• Ultra-Soft Feel: Made with 100% Airlume combed and ring-spun cotton (4.2 oz/yd²), this fabric is pre-shrunk and feels broken-in from the very first wear. It's lightweight and breathable—perfect for cheering from the sideline or relaxing after the big win.

• Built to Last: Featuring side seams for structural support, a ribbed knit collar to prevent curling, and shoulder tape to stabilize the back, this shirt holds its shape season after season—just like her unwavering support.

• Irritation-Free: The tear-away label means no itch, no scratch—just pure comfort, so she can stay focused on every play.

• Perfect Fit: Designed with a retail fit, it offers a classic crew neckline that looks effortlessly cool tucked into high-waisted jeans or layered over leggings.

Made with Integrity

We believe in looking good and doing good. Flag Football Merch is proud to partner with Bella+Canvas, a brand that manufactures its products in the US and internationally in humane, no-sweat-shop, sustainable conditions. They are Platinum WRAP certified and a proud member of the Fair Labor Association. You can wear this shirt knowing it was made ethically, from the blank sourced in Honduras to the final print in the USA.

Every Shirt Has a Mission.
We donate quarterly to the First Snap Society, helping flag football grow coast to coast. Get the gear. Grow the sport.

Origin: Designed in Arizona, printed in the USA

Sizing & Care:
Available in a wide range of sizes for the whole family. Machine wash cold with like colors to keep the floral border vibrant all season long.

Care instructions

• Machine wash: cold (max 30C or 90F)

• Non-chlorine: bleach as needed

• Tumble dry: low heat

• Iron, steam or dry: medium heat

• Do not dryclean