For many years I have always preferred cotton t-shirts or shirts with a polyester/cotton ratio of at least 50/50. These new training shirts look different because they are 100% polyester and feel great. I love the baseball jersey style with sleeves and the loose, comfortable fit. I'm 6'1" and my chest is 42" so I ordered a size up. If you're younger you might be a little tighter if you're proud of your pecs and abs, but at 55 I've opted for a looser fit despite being fit. Looks great for a t-shirt!
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