You might have noticed that Billy Horschel has a loud-looking putter grip at the 2016 U.S. Open, and that's because he does.
Horschel is using a relatively new putter grip called a Flat Cat. The idea behind the design is that the grip is shaped like a rectangular box, with the longer flat sides placed on the putter square to the face. The hands are then laid (relatively) flat on the grip, promoting a long-held belief that keeping the lead hand square to the target and to the blade at impact will lead to better putts.
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The Flat Cat grips come in four different sizes, and Horschel is using the smallest of the four, which weighs 45 grams.
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Horschel is a middle-of-the-road putter on the PGA Tour this season. Coming into this week, the former FedEx Cup champion and three-time PGA Tour winner was ranked 71st in strokes gained putting.