Gore-tex gear works better in COLD than in heat. And don't forget doing S. America means just as much COLD as heat. Once you're up in the Andes of Ecuador, Peru', Bolivia and Patagonia ... it's cold, rainy windy.
So you need gear to cover both situations.
In heat I wear dirt riding gear with my own elbow, knee, and back protector.
My jacket has armor removed, I just wear it OVER my armor ... and in heat strap it back of bike. Simply, cheap rain gear adds extra warmth over any decent riding jacket.
I wear leathers in cold. I carry both. The dirt pants pack down to nothing and leathers are good up to about 85F.
Honestly guys ... you really don't need a $1250 made in China Klim jacket.
Sure, they are well made and designed. But there's much more to it ... it's really a simple issue.