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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Description

🖐️ Support your fingers, support your life — comfort that keeps up with you!

BUILT FOR REAL LIFE - Waterproof and durable materials mean no interruptions—even in the shower or during handwashing.
CONFIDENCE IN EVERY PACK - Trio 3-pack with multiple sizes plus a downloadable sizing guide ensures you never guess your fit.
TAILORED FIT EVERY TIME - Dual-angle design lets you switch between snug or relaxed support in seconds.
ALL DAY COMFORT ZERO BULK - Low-profile, lightweight splint that stays discreet and comfortable from work to workout.
VERSATILITY MEETS PRECISION - Ideal for trigger finger, mallet finger, crooked finger correction, and more.

The Brace On EZ Finger Splint Trio Pack offers adjustable, low-profile support for various finger injuries including trigger and mallet finger. Available in three sizes with a dual-angle design, it ensures a customizable fit that’s waterproof and durable for all-day, everyday use.

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