[version_five]

Not the op, I have some winter running base layers made of meriono wool and and I swear by merino wool glove liners to wear when running outside on the cold. I don't think anything wool would be suitable for exercise when it's warm, but I've never tried it.

[civilitty]

The merino wool mixes from REI work well in warm weather, especially when hiking where the temperature experienced can swing wildly due to sun exposure, sweat, and wind. It has the benefit of keeping warm even when wet much like wool but it breathes better.