About The Brand - Theory Believes The Perfect Outfit Can Change The Way You Feel. For Over 25 Years, Theory Has Developed Innovative Fabrics And Highly Functional Pieces That Feel Great And Fit Perfectly. Theory's Seasonal Collections Are Versatile, Expertly Tailored And Easy-To Wear. Wool-Blend Vest In Black 96% Wool 4% Elastane Dry Clean Only Imported