Most youth gymnastics shirts are 100% cotton. Some girls' or color-specific options use cotton/polyester blends (commonly 50/50 or 52/48), and a few colors use a 90% cotton / 10% polyester blend.
Common designs include printed text—such as collegiate-style or colorful block “Gymnastics” lettering—along with gymnast silhouettes and other sport-themed graphic artwork.
Most product details list crew necklines and basic short sleeves (standard short-sleeve style).
Care instructions commonly recommend machine washing cold and turning the shirt inside out, then tumble drying on low or hang/line drying. Many listings also advise against bleaching, dry cleaning, and ironing directly on the design.
Product listings use terms like 'Lightweight Fabric' and 'Year Round Fabric Construction' to describe fabric weight or intended seasonal wear.
Several colors are listed as 100% cotton (for example: Berry, Cream, Forest, Mustard, Dark Lavender, Light Pink, Royal, True Navy, White). Heather Grey is listed as 90% cotton/10% polyester; multiple other colors are 52% cotton/48% polyester; and one girls' tee is 50% cotton/50% polyester.