Marvel Loki Ugly Christmas Sweater Sweatshirt It's time to trim your tree, wrap your presents, and get on Santa's Naughty list by becoming a villain on the Marvel Loki Christmas Sweater Black Sweatshirt. Loki, wearing his horned helmet, is featured in an ugly Christmas sweater style on this festive black Loki sweatshirt. 80% Cotton, 20% Polyester.