The CribShield Full Coverage Mesh Liner is simply safer and smarter: The newly redesigned, award-winning CribShield reduces risk of suffocation and entanglement. Combines innovation with safety to offer everyone a better night's sleep. Soft, breathable mesh panels keep Baby's arms and legs safely inside. The CribShield Full Coverage Mesh Liner is used after the bumper has been removed from the crib at 9 months or when baby can sit up unaided or pull to a standing position. Use when mattress is at lowest level only. Fits Standard Slatted & Convertible Cribs.