Help with fabrics

I'm looking to buy a couple of long sleeved t shirts. I can do very thin knits, but I'd rather not. I'm looking for... A specific type of fabric. Yeah I can sort by material and composition, but still, I'm not sure I'll be getting the feeling I'm looking for, especially since the filters are an OR situation and not an AND. Specifically I'm looking for viscose AND elastane, but the search results are full of viscose or elastane, the latter usually mixed with polyester. I'm okay with polyester, but I'm really looking for the really thin, cool to the touch, really stretchy feel of viscose, you know?

The tops I have at home are a specific percentage, but on the app, you can't filter percentages, so even if it does contain viscose, will a 25% viscose have the same feeling with 95% viscose?