Most boys' union suits are made from polyester—often labeled as 100% polyester. Common fabric names in listings include Micro Fleece and Microfiber.
Union suits commonly use full-length front zippers or half-length front zippers; a few listings note inverted zipper details as a style accent.
Most listings recommend machine washing and tumble drying. One listing gives more specific care: machine wash inside out in cold water on a gentle cycle, tumble dry low, and avoid bleach and ironing.
Some union suits have hoods (including hoods with character face details), while others feature a simple round neckline without a hood.
Many union suits feature character-themed prints and hoods with face or 3D mask details—descriptions often mention iconic prints and snug hoods that show character faces or eye cutouts.