The Sport Tank is a full dye sublimated design with a more relaxed cut than the regular singlet. This tank is also made with a much lighter weight fabric. Featherweight Compression fabric is high stretch and very light. For comparison, Chito-X material (used in the regular racing uniform) is 255g/sm and Featherweight is 140g/sm.
These tanks do not have extra lining in them.
For sizing, think of the fit as similar to a running tank - athletic but not skin tight. If you want the fit to be tighter, just choose a size down from your regular and make it tall (a relaxed fit Large could a be a tight fit Medium tall)
Regular shipping is free for this item but Express Post will add cost.