Grey Ghost Gear SD Mega GT Sling, BLK 9032-2 Whenever a company that makes fast things want the consumer to know they are sporty and fast" we see GT in the name. Originally the abbreviation was for the term Grand Touring" that referred to the item being used for long distances in comfort. The original SDS is a rugged sling that is light weight and very affordable" but we wanted to make a higher speed sling design that shaved ounces while retaining strength and comfort.