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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🖐️ Heal in style, stay unstoppable.

WATERPROOF DURABILITY - Stay active and worry-free—splint withstands water and daily wear effortlessly.
CUSTOM FIT FLEXIBILITY - Sizing kit options ensure the perfect snug fit for maximum comfort and effectiveness.
DISCREET PROFESSIONAL - Sleek design keeps your finger supported without drawing unwanted attention.
SEAMLESS ALL DAY COMFORT - Low profile and lightweight design lets you wear it day and night without disruption.
VERSATILE HEALING SUPPORT - Ideal for arthritis, trigger finger, crooked fingers, and more—tailored relief for your needs.

The EZ Finger Splint Trio by BraceOn offers a lightweight, waterproof, and durable solution for finger injuries and conditions like arthritis and trigger finger. Its low-profile design ensures comfortable, discreet wear throughout the day and night, with sizing kits available for a perfect fit.

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