The Chief OS is a the Chief you love but with the extra fade you've been missing. The retooled rim and thicker bead gives the Chief OS a cleaner feel in your hand while keeping the slim profile that made the original Chief so great. 
 
Sure Grip is Gateway's basic plastic. Like the name says, this is a very grippy polymer blend. For putters, there are actually several different blends including Soft, Super Soft, Super Stupid Soft, RFF, Eraser, and more.