My DD has that Mizuno in her bag, and will not use it. Purchased it when she was 14, used for u16/u18 catching 50+mph and developed thumb pain. Met with a catching coach, ran into a catcher with the same mitt who had a torn thumb ligament and ended up quitting that position.
The mitt (we had) has NO thumb support and the wide hand pocket pushes the thumb out to a dangerous angle, then add the pressure of 100+ pitches over 3 games per day. My DD was out for 4 weeks due to the injury, came back with a Nokona.
DD is LHT.
If your mitt has a thumb support or your DD has a thumb brace maybe she'll have better luck. I contacted Mizuno and was told tough luck.
The mitt (we had) has NO thumb support and the wide hand pocket pushes the thumb out to a dangerous angle, then add the pressure of 100+ pitches over 3 games per day. My DD was out for 4 weeks due to the injury, came back with a Nokona.
DD is LHT.
If your mitt has a thumb support or your DD has a thumb brace maybe she'll have better luck. I contacted Mizuno and was told tough luck.