Whether you choose Classic or Cozy, Aden and Anais sleeping bags can be worn over baby pajamas to provide warmth without the danger of loose blankets. Their Classic Sleeping Bags are made with a single layer of breathable muslin for perfect contentment throughout the year. Their Cozy Sleeping bags have four times the thickness for colder nights and climates. Aden and Anais was been nominated for the 2012 Cribsie Award "Coziest Sleep Sack". The Cribsie Awards recognizes the best products for babies, tots, and the parents. Shop here to see the complete Aden and Anais collection.