The Windsor® Starter is a Flexor™ SBS polymer modified asphalt starter shingle manufactured for use with the premium Windsor® shingle. It provides the same increased flexibility, higher tensile strength, tear resistance and premium impact resistance as the Windsor® shingle, and features the Scotchgard™ Algae Resistant Shingle Protector from 3M. The Windsor® Starter is manufactured blended to match the Windsor® shingle.