Re-covering something on shabbos with something that increases heat (דבר המוסיף הבל); increasing or changing the insulation on Shabbos; insulating a cold item on Shabbos.
Rabbi Aaron E. Glatt, MD, FACP, FIDSA, FSHEA is the Associate Rabbi at Congregation Anshei Chesed and Assistant to the Rabbi at the Young Israel of Woodmere. He has been giving a Daf Yomi shiur for nearly 25 years, and also gives a weekly gemara be’iyun shiur, daily halacha shiurim, and many other classes. An international lecturer on medical and h...