Straight from Russia, these are the high-quality, authentic Russian military undershirts, modeled after shirts actually worn by the Russian Navy, the Russian Airborne Forces (VDV), and the Russian Naval Infantry (Marines) under their uniform. This specific version has woven blue stripes and long sleeves. This version is also extratremely comfortable; there is a good amount of stretch. These sailor shirts were manufactured using methods from the 1970s, making these "vintage" long sleeved telnyashkas have a more lightweight weave than the current issue ones. They are called "Telnyashka - Тельняшка" derived from the Russian word "Telo", which means "Body".
Please see approximate measurements below.