This is the most popular wool-blend Cooler sold in this country. 80% Wool, 20% Nylon. Blending the wool and nylon fibers together does two very important things. First, it makes for a much stronger fabric than the identical all-wool product would ever be. Secondly, but perhaps more importantly, the nylon fibers help to minimize shrinkage. Woven to last years and years. Made in U.S.A.