The soft undersleeve is falling apart. How to buy new soft undersleeve? It is not comfortable without it.

Hi there. You can purchase the under sleeve separately. https://www.amazon.com/BraceAbility-Undersleeve-Plastic-Splint-Protective/dp/B076JKM68H/ref=sr_1_2?keywords=hard+thumb+splint&m=A3HG8DDA62KJ2X&qid=1575053653&s=merchant-items&sr=1-2

Has anyone ever tried this under a baseball glove while catching?

I am not a baseball player, but if the glove is loose enough it would probably fit snugly because it adds about 1/4” (my guess). If your thumb swells during the game, you could have difficulty getting glove off. And when you do please ice your thumb to reduce the swelling. Of greater concern is the functional limitations it puts on hand use. It would distort your ability to grab the ball tightly. The point of the brace is to prevent you from bending your thumb joints particularly the DIP and PIP. But the strap holding it on also restricts movement of the MCP joint. When I wear it I cannot touch my little finger with the tip of my thumb. I would not be able to hold a baseball tightly, although I might have a strong grip on a bigger softball. Hope this helps.

Can this go in water?

Yes, you may wear this item in water.

Which knuckle do you measure distal? Proximal MP?

Tracy, thanks for your question and in this case, Distal means the farthest away from the wrist (so it would be the joint right below your thumbnail) while Proximal MP would be the next joint down from the Distal. The Distal is also called an IP Joint while the Proximal MP is also referred to the MPC Joint. I hope this helps! Please let us know if you have any other questions. Thank you for your interest in our products. BraceAbility Customer Care Team.

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BraceAbility フィンガーサポーター指サポーター親指のスプリント堅いプラスチック親指腱炎捻挫関節炎ブレース(Medium - Left Hand)

BraceAbility フィンガーサポーター指サポーター親指のスプリント堅いプラスチック親指腱炎捻挫関節炎ブレース(Medium - Left Hand)

Product ID: 755876821

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Details

Brand
BraceAbility
Size
Medium Left
Specific Uses For Product
関節炎
Use for
Hand
Age Range (Description)
大人

💧Durable, waterproof polyester wristband

📏Fits 2 5/8"-3" thumb circumference

🛡️Rigid plastic splint for ultimate thumb stability

Description

🖐️ Lock in your thumb’s future—support that works as hard as you do!

DISCREET UNDER GLOVE WEAR - Slim profile fits comfortably beneath gloves, perfect for typing or low-impact activities without sacrificing support.
UNYIELDING THUMB PROTECTION - Rigid plastic splint prevents thumb bending, ideal for arthritis, sprains, fractures, and ligament injuries.
ALL DAY COMFORT WEARABILITY - Lightweight design with added padding minimizes friction and skin irritation during extended use.
BUILT TO LAST RESIST MOISTURE - Waterproof polyester wristband guarantees durability and hygiene through daily wear and sweat.
PRECISION FIT FOR TARGETED SUPPORT - Medium size tailored for left thumbs measuring 2 5/8" to 3" circumference ensures a snug, effective fit.

The BraceAbility Medium Left Hand Finger Supporter features a rigid plastic splint designed to immobilize the thumb, providing targeted relief for arthritis, sprains, fractures, and ligament injuries. Sized precisely for thumbs with a 2 5/8" to 3" circumference, it offers all-day comfort with friction-reducing padding and a waterproof polyester wristband for durability. Its slim design allows discreet wear under gloves, making it ideal for professionals seeking reliable thumb support without compromising daily activity.

Specifications

Part number	11F0201ML
Item Weight	31.2 g
Product Dimensions	11.89 x 6.35 x 5.33 cm; 31.18 g
Is Discontinued By Manufacturer	No
Size	Medium Left
Color	ブラック
Material	ポリエステル
Special Features	調節可能
Specific Uses For Product	関節炎
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	11.9 x 6.4 x 5.3 cm

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