Guys have worked out for years without wearing any kind of top. It's great for keeping you cool and not having to deal with wet, uncomfortable fabric, but activewear has become so advanced that it's actually better to wear one of the many kinds of tops that are available instead of going shirtless. For one thing, fabric these days usually has wicking performance that quickly dries and cools you as you sweat. Compression fit sportswear ensures that your muscles are less fatigued by supporting them, which also help you excel when you're on the field, court, or in the gym. Long sleeves or short sleeves each have their own benefits, but a lot of it comes down to personal preference. There's also the option of no sleeves or sleeveless. Find whatever works for you on HisRoom!