Abstract: A netting defines an enclosure for a crib or the like having four sides and a top of open weave fabric, and an open bottom, the lower corners of the sides are sewn in puckered relationship to elastic material to define elasticized corner flaps which can be snapped beneath the corners of a mattress similarly to so called "fitted" lower sheets whereby the netting can be easily installed or removed without disturbing an occupant of a crib or the like. Preferably the lower parts of the sides and end panels are of close weave fabric and the corner flaps are formed in this fabric. Fasteners are provided for retaining the enclosure in an extended position above the mattress.