Dating back to the Middle Ages, the process of boiling wool has long since been perfected creating a dense fabric similar to felt. After the wool fabric has been woven or knit, it is subjected to hot water and agitation to cause the scaly wool fibers to meld and shrink up to half its original size. The resulting material is tentered and the process is repeated until a uniform fabric is achieved that no longer shrinks while wet. Mood's Boiled Wool collection is loved by top fashion designers for its sheer quality.