You can swing like a pro.
Insert the card into the glove. Your glove upgrades to training aid.
Only wearing a card glove changes swing.
Since it holds the wrist of the leading hand, turning the torso is caused naturally.
Pulling or pushing the card a little to fit is easy.
A cover with velcro holds the position of the card you set.
Putting on the glove again is convenient also.
If you pull out the card from the glove, it becomes a normal glove exactly.