Skip to content
PRINTED IN THE USA – FAST DELIVERY
FREE SHIPPING ON ALL ORDERS $50+
TRENDING NOW: HALLOWEEN & CHRISTMAS TEES
Save 29%

Mademark Teenage Mutant Ninja Turtles Cowabunga I'm 12 Years Old T-Shirt

Mademark Teenage Mutant Ninja Turtles Cowabunga I'm 12 Years Old T-Shirt

Regular price $18.95
Sale price $18.95 Regular price $26.95

Find your perfect fit – all sizes are US standard unisex measurements.

📏 T-Shirt Measurements (in inches)

Size Chest Width Body Length Sleeve Length
XS 16.5” 27” 8”
S 18” 28” 8.25”
M 20” 29” 8.5”
L 22” 30” 9”
XL 24” 31” 9.25”
2XL 26” 32” 9.5”
3XL 28” 33” 9.75”

📝 How to Measure

  • Chest Width: Lay your favorite tee flat. Measure 1" below armpit, across chest from seam to seam.
  • Body Length: Measure from the highest point of shoulder to bottom hem.
  • Sleeve Length: Measure from shoulder seam to end of sleeve.

💡 Sizing Tips

  • All shirts are unisex – for a more fitted look, size down; for oversized style, size up.
  • If you’re between two sizes, we recommend choosing the larger one for comfort.
  • Our tees are pre-shrunk but may shrink up to 5% after first wash.
  • Orders over $50 ship free
  • 30 day returns

Product Detail

Our tees are crafted with premium 100% cotton (180–200gsm), designed to be soft, breathable, and durable.
Every print is created using eco-friendly, high-definition inks that stay vibrant wash after wash.

  • Unisex fit (true to US size)
  • Pre-shrunk for minimal shrinkage
  • Ethically produced & shipped worldwide

**Mademark x Teenage Mutant Ninja Turtles - Cowabunga I'm 12 Years Old T-Shirt**

🦸‍♂️ **Celebrate Your Inner Hero**
Get ready to embrace your love for the iconic Teenage Mutant Ninja Turtles with the exclusive Mademark x TMNT "Cowabunga I’m 12 Years Old" T-Shirt! Perfect for fans of all ages, this stylish tee is a must-have for any young ninja enthusiast.

🎉 **Fun Design for a Special Birthday**
Featuring a vibrant graphic of the beloved turtles, this T-shirt is designed to bring smiles and good vibes to any birthday celebration. The bold “Cowabunga I’m 12 Years Old” text adds a fun twist, making it an excellent choice for your child’s big day.

👕 **Comfort Meets Style**
Crafted from high-quality, breathable fabric, this T-shirt ensures all-day comfort, whether they're hanging out with friends or engaging in action-packed adventures. Its relaxed fit makes it easy to wear, while the eye-catching design ensures your child stands out in any crowd.

🌈 **Versatile and Trendy**
Available in a lively color palette, this T-shirt pairs effortlessly with jeans, shorts, or even a cool jacket for those chillier days. Encourage your little one to express their unique style while showcasing their favorite heroes in a half-shell!

🎁 **Perfect Gift for TMNT Fans**
Searching for the ultimate gift for a birthday or special occasion? Look no further! This T-shirt is sure to delight any young fan of the Teenage Mutant Ninja Turtles, making it an unforgettable addition to their wardrobe.

📏 **Available Sizes**
Choose from a variety of sizes to ensure the perfect fit for your budding ninja.

Don’t miss out on the chance for your child to celebrate turning 12 in style with this exclusive Mademark x Teenage Mutant Ninja Turtles T-Shirt – where comfort meets fun in every stitch! 🐢✨

Premium Comfort

Soft cotton tees you’ll want to wear every day.

Meaningful Designs

From pets to art to humor, find a tee that tells your story.

Perfect for Gifting

Thoughtful, unique, and sure to bring a smile.

Trusted Worldwide

Thousands of orders shipped with care.

Questions check here

Not Just Tees — It’s Your Story
Premium Cotton Comfort — Bold Graphic Designs.
US Standard Fit — Worldwide Shipping
Express Yourself — Wear Your Vibe.
Thousands of Happy Customers — Join the Bacoza Family