Auto interiors are usually leather and matching vinyl. Hot tub covers and boat upholstery are almost always vinyl. A wide array of materials are used on home furniture. A tag may state what the outer upholstery fabric is. Removable cushions are a sign of good quality leather. So is price. As of 2018, average quality top grain leather cost US$100 / yard. A typical three-seat sofa requires 15-20 yards of material and costs $1500 - $2000 in leather alone. If you bought a new couch for under US$2000, it's likely faux leather. Learn more about the many types of real and artificial leathers here. If you're still unsure, consult a pro here.