Have been looking for the perfect running singlet and this one is up there. Comfortable, durable and very well ventilated.
S and XL available in "Sulphur Yellow":
https://www.runningwarehouse.com.au/New_Balance_Mens_Impact_…
All sizes available in "Helium":
https://www.runningwarehouse.com.au/New_Balance_Mens_Q_Speed…
These impact singlets are the best i've used for summer running, they are softer, strechier and vent just as much compared to the $60+ Nike and Asics performance singlets.
These can be had at the outlet stores for $5-15, but sizes typically limited, more of a buy on sight type thing.