Aden and Anais sleeping bags are the absolute best. If you want your baby to be cozy and covered all night in 100% cotton this is the best brand. Many other sleep sacs are made of combination cotton/polyester or all polyester which is not a breathable material. Baby tends to get overheated. 100% cotton helps baby maintain their natural body temperature and stay warm. I have purchased both the four-ply and the thin summer weight sleeping bag. Both are fabulous.
keeps baby warm and covered
baby can wear for a long time
Consslightly expensive, but then again, you get what you pay for