Disclosure: I received the items mentions in order to facilitate my review. However all opinions are 100% my own and may differ from yours. 
Do you have have sleeves that just aren’t long enough? I mean they almost make it but not quite. Since I am short I only have that problem with petite shirts. kuphs though has eliminated that problem. 
kuphs are just what they sound like, cuffs that you out on to add length to your sleeves or just to make a stylish statement. I received four different kuphs, two of which quickly found their way to my sister in-laws wardrobe, and I must say I like them.
The story behind kuphs® began while I was stuck in bed getting over the flu. Bored, I picked up a set of knitting needles and proceeded to knit a scarf. Because I have the attention span of a gnat, I soon realized that making a scarf was going to take too long. I ended my short-lived project almost as quickly as it began and I was left with a knitted piece of, well, nothing. Or so I thought… I carelessly flipped and flopped this piece of knitted “nothing” around until it landed on my wrist. I stared at it for a bit and remembered a cute cropped jacket I had hanging in my closet. Although the jacket fit like a glove, the arms were too short! I only wore it once since it seemed to be too small, but really it was just the arm length that was the problem.
These green ones are my favorite! I love how they lol with my white jacket. They are knitted and are one size fit all. To me they are super stylish and I save these for those cold mornings when i need a little something extra. 
As you can see they look fabulous when they are on!
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I had to find out what these were, having just glanced at the picture. Great idea since I have long arms (5’7) and have given up and gone with 3/4 sleeves. I’ve seen the Invisibelt company come out with some too. Love the green ones as well.
I like the story about how the designer came up with the idea. Some of the best ideas begin with a simple, happy accident. I don’t personally have a use for this and I don’t see my wife really using something like this, but it potentially catch as a fashion thing.