The feeling of being very comfortable, warm, and cozy.
Snugness is a nice feeling, like when you are wrapped in a warm blanket on a cold day.
Examples:
I love the snugness of my bed on a cold morning.
The kitten curled up in the snugness of the blanket.
The snugness of the fireplace made the room feel cozy.
The snugness of the sweater made her feel warm and happy.
The snugness of the bear hug made me feel safe and loved.
The snugness of the sleeping bag kept me warm all night.