do these work on the thumb?

It depends on how long your thumb is I have really short fat fingers and had to return these and make my own splint

how do I know what size to get, I see no guidance for this.

There is a pdf file link in the full product description. It asks you to print out a sizing band at default printer settings. However, using a new Brother printer, it printed out 1/16 of an inch too small, and I had to bump it up to 103% to make it match the 3½" marker on the printout.

Are these very rigid or semi-flexible? Could I type while wearing it?

They are Rigid n strong. I use one on my pinky n one on my thumb and I type all day on & off with these. I have RA and when my fingers are swollen n stuff, to bend them gives me extreme pain !! So I bought these splints to prevent my fingers from bending you can take them off, move them around. Also another note: I have bigger sizes, there’s one where it comes w/ 32 sizes on a big round keychain. When my fingers r swollen or if ur finger is Broke, you will go they several different sizes. So getting the 3 pack in ur size is perfectly fine, but you may need a few in the sizes before & after I hope this helps !! Good Luck !!

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EZ フィンガースプリントトリオ 3パック (10、11、12)

Product ID: 769509783

Details

サイズ
10 11 12
ブランド
Brace On
ユニット数
1.0 個
商品の個数
3
商品の重量
1 オンス

💧Waterproof & durable for all-day use

⚖️Ultra-lightweight at just 1 oz

🖐️3 sizes (10,11,12) for perfect fit

Description

🖐️ Support your fingers, not your excuses!

WATERPROOF DURABLE - Built to withstand daily wear and moisture, keeping you protected longer
DISCREET LIGHTWEIGHT - Minimalist profile means no clunky braces—comfort meets invisibility
SEAMLESS ALL DAY COMFORT - Thin, breathable design lets you wear it day & night without bulk
PRECISION FIT FOR EVERY FINGER - Comes in three sizes to ensure snug support without restricting movement
STAY PRODUCTIVE STAY PROTECTED - Ideal for keyboard warriors battling trigger finger—type freely without disruption

The EZ フィンガースプリントトリオ 3パック offers lightweight, waterproof finger splints in three sizes (10, 11, 12) designed for comfortable, all-day wear. Perfect for managing trigger finger, arthritis, and joint injuries, these thin splints provide discreet support that won’t interfere with typing or daily activities, making them a must-have for professionals seeking both relief and productivity.

Specifications

ASIN	B07S6Z733T
UPC	726481279833
おすすめ度	4.2 5つ星のうち4.2 (613) var
サイズ	10,11,12
パッケージ内に含まれる商品の数	3
ブランド名	Brace On
メーカー名	Brace On
ユニット数	1.0 個
商品の重量	1 オンス
商品本体サイズ	12.7 x 7.6 x 2.5 cm

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