Today's One Day Only sale is on SmartPak's own Eqology line of clothing. The pieces in the collection are moisture wicking and breathable. I've had my eye on the color blocked shirt for a while, but I wasn't too excited about paying $50 for a t-shirt. I can get the same thing at Kohl's for half the price which I actually just did.
I've found that SmartPak will usually extend these one day only sales a few extra days, but just in case they really mean it this time, get yours early! I bought it in blue/green. Which one did you get?