Wood- Look for hardwood construction. Beech, Oak, Ash, Maple,and Teak are strong. Upholstery Frame- Look for Kiln -dried hardwood frames with double doweled and glued blocked corners. Coils and Springs- Look for Hand tied supported springs. When sitting you should feel an even resistance and pressure. Foam should have a density of 32 and Higher. Warranty- Look for a 5 to 10 year. Fabric - Look for fabrics over 50,000 double rubs. Look for stain protection that is built in the yarn not sprayed on.