BrumJim said:
General feeling is that most (All?) man-made wicking material does suffer from smelliness.
Some are a lot worse than others. The early Helly Hansens were well known for making you gip by the end of the first wearing.
The standard polyester cycling top isn't very comfortable without a wicking layer under it, especially if you ride in bib shorts like most of us. I use M & S vests/sports vests, which are mainly polyamide with a bit of something stretchy, and don't go smelly any quicker than natural fabrics*. Not the cheapest, but easy to get.The vest gets rinsed every day and the cycling top every couple of days.
Some people also have smellier sweat, partly natural, partly diet. Turmeric for instance goes straight to your sweat glands and asparagus is nearly as bad.
[*I like the idea of one of these bamboo, recycled cardboard and yoghurt jobbies. Thanks for the link, BenB.]