The main difference is that a Snuggie is designed to be worn backwards like a robe, with the opening in the back, while a comfy hoodie is a regular front-opening sweatshirt. The Snuggie also has sleeves cut in one piece with the blanket body for a very loose, roomy fit. A comfy hoodie has fitted sleeves and hems for a more tailored look. A Snuggie is positioned as a wearable blanket while a comfy hoodie is more of a conventional garment.