THUMB-PER: White Lightning
Improve your swing!
The Thumb-per batting aid gives you a proper bat grip, a quicker bat through the zone, and prevents bat sting.
Get a more powerful bat position in your hands for quicker contact and reduced bat sting.
The ergonomic design is a big improvement over current batting aids. Give one a try!
You can measure with a string or ribbon the cicumference of the thumb to be used as a reference:
L- 2 3/4" circumference
M- 2 1/2" circumference
S- 2 1/4" circumference
Use this as a guide. If in between sizes, I generally recommend going with the smaller size for a secure, snug, performance fit.