Is this useful for a 12 year old girl to learn how to improve her swing?

This question is best answered by a professional. However, I do believe that just concentrating on a swing that is inside out leaves much less of a chance of the left wrist breaking down. That seemed to be true in my case and eliminated the need for the brace. Hope this helps.

Not sure which product you are looking at. The picture is a wrist band, I ordered and receive an arm band which is what I reviewed. If you are looking at the arm band, yes it is universal. However, someone with big arms may feel it's a little bit too tight. I does stretch.

ASIN	B00HVCYB00
Brand	Scott Edward
Brand Name	Scott Edward
Colour	Black
Country Of Origin	USA
Customer Reviews	4.0 out of 5 stars 2,015 Reviews
Golf Club Flex	Stiff
Golf Club Loft	45 Degrees
Golf Club Type	Putter Golf Club
Golf Flex	Stiff
Golf Loft	45 Degrees
Grip Material	Synthetic Rubber
Grip Type	Supportive
Hand	Ambidextrous
Hand Orientation	Ambidextrous
Manufacturer	Scott Edward
Size	One Size
UPC	887898108458 714046997667
Unit Count	1.00 Count

Scott Edward Golf Wrist Brace Band, Golf Swing Training Correct Aid, Practice Tool, Swing Gesture Alignment Training Aid

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