Lifenest is a highly breathable sleeping and ergonomic sleep positioner babies Life nest is the most unique sleeping system since the invention of the mattress itself. While sleep is the most important aspect of a newborn's life, it is the main cause of anxiety for parents. The Lifenest sleep system has addressed every parent's concerns to prolong sleep, promote comfort, reduce the risk of suffocation, and diminish overheating. The innovative design provides a curved surface that cuddles the baby. Physician designed for babies' wellness, the Lifenest naturally maintains babies in a comfortable back sleeping position. The supportive inclined netting, allows babies to breathe through if they flip over. The hammock part provides a curved surface that cuddles babies. The hypoallergenic netting is dust mites' free. About the hammock - allows unrestricted movement and maintains the back-sleeping position. Permits the baby to breathe freely even on stomach as well as eliminates liquid/mucus build-up. Maximizes the baby's relaxation while reducing sweating and overheating. Ventilation channels allow a free airflow accelerating the evacuation of exhaled CO2. The zippered sheet prevents cover sheet from moving and the ribbons on the side of mattress secure to the crib slats. The Lifenest passed the open flame test. Machine washable. Lifenest sheet is waterproof for easy maintenance. Stores easily and travels well in its convenient carry-bag. Item dimensions 27.5" X 33.5" X 4.7". Extra cover sheets, white and colored are sold separately to compliment your nursery.