I love merino base layers in general because they are extremely comfortable in all temperatures. They manage to feel cozy and refreshing at the same time, whether it's hot or cold. The EGi is one of the best price points I've seen and is perfect to start with. The white is a bit see-through if you're hairy (not because it's thin - it's actually pretty bold). I would use it as a tank top rather than a t-shirt. But wow, would that be the perfect luxury for the gym? Increase the size if you want it to be a t-shirt.
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