New for the season
Holiday Ball.
Baseball spirit, holiday cheer. Meet our Santa Claus tee—the first in a growing seasonal collection.
Original baseball lifestyle apparel
Wear the game.
Tell your story.
Original tees for players, coaches, collectors and everyone who lives for baseball. From dugout stories to imaginary ballclubs—find your next favorite shirt.
Stories from the game.Made to wear.
Printed in the USAPremium soft-feel teesUnisex sizing · S–2XL30-day free returns*Secure Shopify checkout
The game goes with you
From the dugout.
To every day.
For the team, the coach and the postgame ice cream crew. Baseball is a way of life.
All tees $35 · Small–2XL · Black, royal blue, gray & cream · Explore the collection · Ordering opens soon.
Original baseball designs. $35 tees in Small–2XL. Black, royal blue, gray and cream.
Choose your collection
Baseball culture in every form.
From spooky baseball nights to imaginary ballclubs, find the designs that tell your baseball story.
The Halloween collection
Spooky Baseball
Spooky baseball, haunted ballparks and original Halloween designs. All tees $35.
Knuckleball Originals
Premium tees, sweatshirts and everyday baseball lifestyle apparel.
Fictional Ballclubs
Team identities, comic-book characters and leagues that exist just beyond the foul lines.
Art, Prints & Paintings
Bold 24 × 36 prints and original baseball-inspired artwork.
Collector's Dugout
Card checklists, hobby tools, collector humor and stories from the cardboard side of the game.
The unpredictable pitch
Why Knuckleball?
The knuckleball doesn’t follow a straight path—and neither does a life spent in baseball. It moves, surprises and keeps you guessing. That spirit is at the center of everything we make.
“The game gives you stories. The dugout gives you lessons.”
Knuckleball Baseball Company is a home for original baseball culture—where the past stays alive, the game stays fun and every story has another inning.
Good stories. Great tees.
Made for life around the game.
Premium quality tees with a soft, lightweight feel—comfortable in the bleachers, around the dugout and wherever the day takes you. Original front-print designs, printed and shipped from Detroit, Michigan.
Fit & feel
Adult unisex sizing in Small, Medium, Large, Extra Large and 2XL. A soft, lightweight feel for everyday comfort. Choose a little extra room if you prefer a relaxed fit. Lifestyle photos show styling; the options listed on each product determine the sizes available.
Find your fit
Compare with a favorite T-shirt that fits you well. Lay it flat, measure across the chest from underarm to underarm, then measure from the highest shoulder point to the bottom hem.
Need help choosing? Send us the design name, preferred size and your measurements before ordering. Adult sizes S–2XL are offered; youth sizes are not currently listed.
Fabric & print
Premium soft-feel tees with original artwork on the front. Fabric composition can vary by shirt color; check the garment label for the exact cotton or cotton-blend content.
Printed in the USA refers to the decoration of the shirt, not the manufacturing origin of the blank garment.
Care for your tee
Wash inside out in cold water with similar colors. Use mild detergent and avoid bleach. Tumble dry low or hang dry. Do not iron directly on the printed design. Follow the care label on your garment.
Shipping & free returns
We print and pack orders in Detroit. Standard shipping is $5.95 for merchandise totals below $70 and free at $70 or more after discounts, before tax. Available to the contiguous U.S. Production time is separate from carrier transit time.
Free returns within 30 days of delivery: request a return for an unworn, unwashed tee in its original condition. We provide a prepaid standard return label for eligible contiguous U.S. orders. Refunds cover the returned merchandise; original shipping charges are not refunded unless we sent an incorrect or defective item.
Contact us with your order number before returning anything. If an item arrives damaged or incorrect, include a photo so we can help. Refunds go to the original payment method after the return is received and inspected.
Questions? Talk to us.
We’re a small baseball-loving business. For fit questions, order help or returns, email david@martinshowdesign.com.
*Free return shipping applies to eligible contiguous U.S. orders. See Shipping & free returns above.
Keep the stories moving
Baseball is what happens between the lines.
For the lifers, the collectors, the coaches, the kids and everyone who still gets there early enough to watch batting practice.
Welcome to Knuckleball