Lots. Do a google search for "Gaiters" and you'll get loads of options.

Here are some from my country, made by Norrona (www.norrona.no), available in both Gore-Tex, Cordura, and Cotton/Polyester:

I use these types of gaiters all the time at home when hunting in wet/cold areas. And of course when skiing in the winter.

For Africa though, I prefer the ancle hightype, as they are cooler.