The best!
"No. its not just an undershirt.This is the ULTIMATE indoor riding shirt. Don't get me wrong- as a layering garment this is extremely comfortable and does an amazing job. as keeping you dry. But I wear this nearly everyday when I am riding the trainer. There is nothing else like it that I can comfortably wear. Its as if it keeps you cool and prevents the "sweat from dripping off you" Far more comfortable than riding shirtless for hours with sweat beading off you continuously in my opinion ."