Keep their heads cool and dry with a built-in HeatGear sweatband found in the Under Armour Boys' Blitzing II Stretch Fit Cap! Its stretch construction provides a comfortable fit for any activity, so they can worry less about their hat and more about the day. The Blitzing II Stretch Fit is structured to maintain its original shape, along with a slightly higher crown, to last years of use. Polyester/Elastane. Imported.