Based on the previous posts, I ordered two polo shirts and two fleece jackets, one each in a medium and an XL. Caution! The men's sizes, apparently in contrast to women's sizes, run larger, at least in these items. They mistakenly pulled a medium for my polo, and it fits just fine! I normally am right on the line between an L and an XL, so I think these are probably a size too big.
My partner usually wears a small, but sometimes a medium. A small would definitely be the right choice for him, no need to go up a size when you order.
The quality is very good and they came really quickly, even with the personalization of the polo shirts, so just a heads up on the men's sizes.