The waist is the width of the grip from side to side. The wide waist feels alot like the T/D sleeve to me, while the narrow feels more pointy (not sharp though) against your palm. I personally did not like the narrow one..didn't feel right to me, and I did not shoot it well. I had the wide one tapered slightly towards the palm side so it didn't have that racetrack look to it, and it worked very well for me! Today I shoot the Schultz style teardrop and that's the one that I like the best!
Spanky