Hi Sam Rule28. Since you may still active here in this thread. Would you mind help answer me a couple question? I really curious. It a bit long question.
I bet the answer is “it’s terrible”. I try UV runner arm sleeve that have thumb hole for sun protection and hope “it help me aerodynamic because wind hate human skin”.
I rides TT position time trial 23km on my local course with UV arm sleeve. I thought it may help aerodynamic because it covered and hug my arm skin nicely. Nope, my time is +2 full minutes slower [I actually expect to be slower but not expect this to be that huge slow].
Some fabric really terrible versus wind drag? UV arm sleeve in question is Polyester material if that matter. And I know it not claim aero. I just put it on for sun protection. It compressed nice and smooth. But time result is very terrible. Unbelievable slow for nice smooth arm sleeve that not even have wrinkle.