eBay has the Hanes Men’s Long Sleeve Cool DRI Performance Athletic T-shirts for only $10.86 with free shipping right now! My son loves these t-shirts for track and football. I usually just stick with black, but there are other colors available. 

• FreshIQ advanced odor protection technology attacks the odor-causing bacteria that causes your clothing to smell — so now you can feel fresh all day.
• Jersey knit performance tee helps you give 100% by working overtime to keep you cool and dry.
• Cool DRI technology dries fabric faster for maximum comfort and has a UPF rating of 50+ for protection against harmful UV rays.
• Contemporary fit.
• Double-needle stitching in neck, sleeves and bottom hem for added durability.
• Available in assorted colors, including neon brights for enhanced visibility.