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Sizing & Fabric

Baseball Shirt Sizing & Fabric.

Get the size right the first time and know exactly what you're getting: Comfort Colors vs Gildan, our size ranges, how each one fits, and how to wash it so it lasts.

Shop the Collections → Personalize a Shirt

By On Deck Co. · Updated June 2026

On Deck Co. premium printed baseball shirt detail
Premium blanksBuilt to last

Buying a shirt online always comes down to the same two questions: what size do I order? and what's it actually made of? This guide answers both so you can order with confidence the first time, no size or fabric surprises. We print only on premium blanks, the same ones the vintage brands that actually feel good are built on, not cheap blanks that itch and lose their shape.

Below: a clear comparison of our two fabrics, how to choose your size (with a 30-second trick that prevents returns), and how to care for the shirt so the print lasts season after season.

The Fabrics

Comfort Colors vs Gildan

We pick each fabric on purpose: one for vintage-feeling tees, one for sweatshirts that keep you warm in the stands.

Tees

Comfort Colors

Garment-dyed cotton · 100% ring-spun

  • Heavyweight ring-spun cotton (~6.1 oz) with a soft, broken-in feel from day one.
  • Garment-dyed for deep, vintage color with subtle variation that makes each piece unique.
  • A relaxed, slightly boxy drape. True to size; size up if you want it oversized.
  • May shrink a touch on the first wash, normal for heavyweight cotton.
Sweatshirts & Hoodies

Gildan Heavy Blend

50/50 cotton-polyester fleece

  • Warm, durable fleece built for cold tournament mornings and late nights in the stands.
  • The poly blend holds its shape and resists shrinking wash after wash.
  • A classic unisex cut. Size up if you like a roomy look or want room to layer underneath.
  • A soft, brushed interior that's comfortable all game day.

Your Size

How to choose your size

Three ranges cover the whole baseball family. Start here, then always confirm with the listing's size chart.

Adult

S–3XL

Unisex sizes with a relaxed fit. Order your normal tee size; size up for an oversized look or to layer.

Youth

XS–XL

For the players on the roster. Available when you personalize so they match mom, dad, and the team.

Toddler

2T–5T

For the littlest one in the bleachers. The same designs, scaled down, so the whole family matches.

The 30-second trick to nail your size

Grab a t-shirt that already fits you the way you like, lay it flat, and measure the chest width from seam to seam. Compare that number to the size chart on the Etsy listing (every one includes it) and pick the closest size. It's the most reliable method, far better than guessing from the label.

Between two sizes? Size up. These fabrics wear relaxed, and most baseball families prefer the extra room for the bleachers and for layering underneath.

Make It Last

How to care for your shirt

A good wash keeps the fabric soft and the print sharp. Four steps, no fuss.

  1. Turn it inside out before washing to protect the print from rubbing.
  2. Wash cold on a gentle cycle with mild detergent. No bleach, and no fabric softener (softener coats and dulls the print).
  3. Tumble dry low or hang dry. High heat is what shrinks cotton and cracks prints the most.
  4. Never iron directly over the design. If you must, iron inside out.

FAQ

Sizing & fabric questions

Do your shirts run true to size? +
Yes. They run in unisex sizes from S to 3XL with a relaxed, true-to-size fit. If you know the size you wear in a normal t-shirt, order that. If you like an oversized look or want to layer at cold tournaments, size up one. Every Etsy listing has a size chart with exact measurements.
What's the difference between Comfort Colors and Gildan Heavy Blend? +
Comfort Colors is a heavyweight, garment-dyed 100% ring-spun cotton tee with a soft, lived-in feel and a slightly relaxed fit — it's our pick for vintage-look t-shirts. Gildan Heavy Blend is a warm 50/50 cotton-polyester fleece used for our crewnecks and hoodies; it holds its shape, resists shrinking, and is built for cold mornings in the stands.
Will the shirt shrink when I wash it? +
The cotton Comfort Colors tees can shrink slightly the first wash, which is normal for heavyweight ring-spun cotton. Wash cold and tumble dry low or hang dry to keep shrinkage to a minimum. The Gildan Heavy Blend fleece is more shrink-resistant thanks to the polyester blend.
How do I wash it so the print lasts? +
Turn the shirt inside out, wash cold on a gentle cycle with a mild detergent, and skip the bleach and fabric softener — softener can coat and dull the print. Tumble dry low or hang dry, and never iron directly over the design. Treated this way, the print stays sharp season after season.
Do you make youth and toddler sizes? +
Yes. Beyond adult S–3XL, our custom shirt tool offers youth sizes (roughly XS–XL) and toddler sizes (2T–5T), so the whole baseball family can match from the littlest player up.

Keep Exploring

Find your shirt

Baseball Mom Shirts → Baseball Dad Shirts → Youth Baseball Shirts → Travel Ball Family Shirts → Personalize a Shirt → All Guides →

Right size, premium fabric

Shop with confidence

Now that you know the size and the fabric, pick your collection or personalize yours with a name and number.

Shop on Etsy →