When the temperature starts to rise maintain your performance with the under armour heatgear sonic fitted sleeveless training t shirtcreated from 90 polyester and 10 elastane this sleeveless offering ensures you stay cool dry and light courtesy of under armours heatgear fabric the lightweight material makes for a comfortable and supportive fit which hugs the contours of your upper body and keeps you cool as the action heats upa stylish plain black design sees the under armour branding s