Generous sack design allows room for kicking, but can?t be kicked off so baby stays warm all night; Foot openings for mobility when awake. * Unzips from the bottom for easy diaper changes * Sleeveless to allow for ease of dressing and freedom of movement. * Breathable fabric keeps baby warm and comfortable * HALO supports non-profit organizations like First Candle/SIDS Alliance and The Canadian Foundation for the Study of Infant Deaths.