This brand new design is only 1” in diameter, compared to the 1.67” Fatso 5.0 and 1.3” Slim 3.0 designs. Its smaller design opens up the oversized putter grip to more golfers looking to experiment with a putter grip that will straighten out your putts. The UltraSlim became the fastest growing oversized grip at the end of the 2010 PGA Tour due to it being 24% smaller than the SuperStroke Slim grip.