Julia on craftsy.com explains the benefits of sewing with wool as well as tips for sewing with wool as well. Since wool retains heat and keeps heat out, it is an excellent fabric to use to keep cool in summer and warm in winter. Wool is absorbent and can absorb up to 1/3 of its weight in moisture. It is hypoallergenic as well as wrinkle and flame resistant, and when cared for properly it will last for a very long time. Wool is an excellent fabric to work with since the edges are clean, without unraveling.