What do "Mittens" mean as symbolism?

Vivian's gloves are a source of comfort and warmth.

Once I'm out of the woods and on the main road, a full moon bathes the fields around me in a shimmering, pearly light. Gravel crunches loudly under my boots; I can feel its pebbly roughness through my thin soles. I stroke the soft wool inside my gloves, so warm that not even my fingertips are cold.