When looking for custom slowpitch uniforms in the U.S., top vendors include companies like Custom Ink, Nike Team Sports, Team Express, Alleson Athletic, and Just Sports. These vendors offer a wide range of customizable options, from jerseys and pants to accessories, with high-quality materials and personalized designs. They cater to teams of all sizes, providing options for bulk orders, fast shipping, and superior customer service. Many also offer online design tools for easy customization.