Best wrap for hot weather?

Which wraps do you like for hot, hot weather? Which ones make you warm vs which can keep you cool?
I live in the tropics, where it's 85-100 degrees F and high humidity more often than not, so I have to constantly consider what fabrics are going to make me a sweaty mess (not to mention baby). I'm really excited to baby-wear, but Ive had a hard time telling the difference in fabrics among the major brands.