The narrowed heel section provides the foundation for cleaner contact (and better control on the shortest shots) by keeping the sole more flush with the ground even when the clubface is open. Meanwhile, the clubface receives a special heat treatment to increase surface hardness and to retain the forged carbon steel's interior softness.
Oh, and those grooves? They're deeper than previous models. The J15 ($120, six lofts, 50 to 60 degrees) is available in satin and oxide finishes and debuts in stores this week.
*Interested in more stories on equipment? Signup to receive Golf Digest Stix, a weekly digital magazine that offers the latest news, new product introductions and behind-the-scenes looks at all things equipment. *