(of a person) feeling warm, comfortable, and protected, or (of a place, especially a small place) giving feelings of warmth, comfort, and protection. (Cambridge Dictionary)
If you feel snug or are in a snug place, you are very warm and comfortable, especially because you are protected from cold weather. (Collins Dictionary)
Something such as a piece of clothing that is snug fits very closely or tightly. (Collins Dictionary)
Comfortable, warm, and cosy; well protected from the weather or cold. (Oxford Dictionaries)
Stylish snug ideas.
Sleep Baby Safe and Snug.