What time is it? Adventure Time! Decked out in this awesome Finn & Jake costume t-shirt, you'll be ready to tackle the next adventure. This white, standard fit shirt is made from 100% cotton. Be sure to check out our Size Chart to get an idea of the average size and dimensions of this Adventure Time Friends Costume tshirt style. Check back often for some of our new Adventure Time with Finn & Jake and other Adventure Time merchandise at great prices only at AnimationShops.com.