Abstract: An electrical warming device (13) for wrapping around the outer circumference of a container (10) for warming moist tissues therein. The heating device (13) has an inner heating pad (18) inserted within the open end (46) of an outer cover (20). A marginal side portion (60) of outer cover (20) may be folded inwardly to shorten the width of the outer cover (20) to adapt the heating device (13) for use on a container (10A) of a lesser height. The heating device (13) is held in secured position about the container (10) by matching Velcro strips (74, 76) on inner and outer overlapping end portions (14, 15) and by tied bows (16) of ribbon ties (66, 68) on overlapping end portions (14, 15).