As mentioned, it's a personal preference. I prefer 3/4 mask with a ball cap, can't stand full mask. I don't like the spandex type in warm weather, but use them when it gets cold. For warm weather I like the loose and lightweight mesh type, the kind that are made of a material similar to bug suits. Primos are my favorite to date and I've owned dozens of various makes. The only masks I've owned that actually fit and allow unobstructed view are the Primos.
Warm weather:
http://www.primos.com/products/maks/mesh-mask/Cool weather:
http://www.primos.com/products/maks/stretch-fit-mask/
