2025 Panini Boys of Summer Baseball delivers a heavy concentration of autographs from the game’s up-and-comers, as well as retired favorites. The checklist includes a variety of themes and clean, classy designs that tap into the sport’s romanticism. Hobby boxes are single-pack affairs with each delivering eight cards. Three of those have signatures with another being a memorabilia card. Among the highlights is Jumbo Material Signatures. While other parts of the product use stickers and other materials to house the autographs, here they’re on-card. These are paired with large swatches, including premium patches for some parallels. Other autographed memorabilia sets include Prospect Material Signatures and Jumbo Swatch Signature Booklets. Jumbo Acetate Signatures give players a large signing surface. This should mean that no dips and loops are cut off. Baseball Signatures, Leather Signatures and Lumber Signatures get their name based on the material used for the autograph. Fan Favorites Signatures, which shouldn’t be mistaken for the similarly named autographs in Topps Archives, offer up more opportunities for ink from retired players. Pastime Materials is among the product’s relics.