Hot Magic material fabric is sewn over parts of the back and thighs. It's a thin quilted material, so you might feel cold in the dead of winter. The item is thick enough that it might not fit in a mailbox as is. I will remove it from the bag and fold it for shipping. If it still doesn't fit in the mailbox, I will compress it, so please be aware of that. Although it is unused, please refrain from purchasing if you are concerned about minor details.