Wool is much more sensitive than cotton and for that reason wool garments can not undergo the same process of laundering through which the cotton materials are taken. On account of its peculiar scaly surfaced fibers, wool has a tendency to "felt," as has been explained elsewhere in this text. Extremely high or low temperature or strong alkali will bring about this felting process and thus destroy much of the soft elastic nature of wool. If an all-wool garment such as a sweater is wrung and twisted, in the manner in which cotton clothes are handled, there is great danger of giving it a hardened almost board-like nature. If such a woolen garment is hung out of doors on a very cold day, or if it is washed in strong alkali soap, or dipped in boiling water, or pressed with an extremely hot iron, the results will be very similar to those mentioned above. It is therefore recommended that wool be washed in moderately warm soft water with especially prepared wool soap (free from strong alkali). It should not be wrung, but the surplus water should be pressed out of it. It should then be hung in a room of moderate temperature and allowed to dry slowly. After such treatment wool garments will be soft, fluffy and elastic like new.