It's called Nike Pro Loose, and comes in either a L/S Crew or Mock, or a S/S Crew.
I went to www.shop.mlb.com
and put in the product # 2207806 for the L/S Crew and they only have 27 of the teams available. Unfortunately as of now, we're not on that list of 27.
I searched for the S/S Crew, product # 2207808, and they only have 14 teams available. Again, we're not on that list.
Lastly, I tried to find the L/S Mock, product # 2207807, and they only have 15 teams available. Strike 3, we're out at www.shop.mlb.com
I went to Nike's website, and they actually seemed to have less teams overall than the MLB site. Again, no Reds.
I did a Yahoo! search in their shopping section, and it actually showed me a picture, but refered me to the MLB.COM site, where it is not available.
Hopefully those product numbers were helpful, but I couldn't find it anywhere on the internet in stock.