If the cuffs on your wool sweater are stretched-out of shape dip them into a bowl of hot water for 3-5 minutes, checking often. Wool reacts quickly to the hot water so be on top of it to control it. Only soak the stretched-out area. Now, gently squeeze out the water, reshape, and lay flat to dry. The hot water relaxes the wool fibers so they will tighten back to their original shape.