Men's Under Armour Heatgear Flyweight Run Singlet

100% Awesomeness: Feel awesome knowing you'll always find your perfect fit with Road Runner Sports! Your friendly Fit Experts are available by phone, chat, in a store, or on email. Feel great knowing that your Fit Experts are trained to help you find just what you need to feel awesome with a few simple questions! Put them to the test-you'll love the benefits you feel on the road!

What's better than feeling awesome? Your World's Best Return Policy, starting with your 90-Day Wear 'Em & Love 'Em Guarantee! As a VIP member test your shoes for 3 months, if you're not totally satisfied, send them back for a return or exchange. Not a VIP? Click here to learn more and rest easy knowing you're never stuck with something you don't love. You can always return apparel, electronics and other unused gear within 30 days (60 days for VIP members!).

Free Shipping: Feel happy knowing that more than 97% of the products on our site ship for free*. You can shop worry free at Road Runner Sports knowing that you never have to meet a minimum dollar amount to get Free Shipping. You can just focus on finding your favorite item!

*Electronics and strollers do not qualify for free shipping.

Warp Speed Promise: Get your gear quick, without jumping through extra hoops! VIP members can count on their order zipping out the door at Warp Speed! Your in stock gear* will be packed up lightning quick and on the truck within 2 hours, thanks to your VIP Warp Speed Promise! Not a VIP, but want to experience Warp Speed as well as the multitude of other VIP Benefits? Click here to learn more.

*Some of the products on RRS.com ship directly from the manufacturer, giving you a wider selection of totally awesome running gear.

Norton Secured: You can shop worry free knowing that your information is safe and sound with Road Runner Sports. Ease your mind knowing that your order and information is VeriSign Secured and encrypted for your privacy.