Why do long sleeves now have thumb holes

All of a sudden I'm noticing sweaters, hoodies, base layer shirts, et cetera with thumbholes at the end of the sleeves. When did this start, and why?

I can guess that, at least for those items that are lower layers, it gives you a way to pull on an upper layer without scrunching the sleeves. For a base layer, it could keep the sleeve under the glove, but not so much for sweaters.

For me, with my proportionately gorilla like arms, it's just a large hole that lets the air in at my wrists.

For those who love them, why? What are they really good for?


Why do long sleeves now have thumb holes