From the manufacturer

Boys' UA Tech Short Sleeve

UA Tech is our original go-to training gear: loose, light, and it keeps you cool. It's everything you need.

• Loose: Fuller cut for complete comfort.
• UA Tech fabric is quick-drying, ultra-soft & has a more natural feel
• Material wicks sweat & dries really fast
• Many UA Tech T's are made with recycled, traceable polyester & re-use about 5 bottles per shirt