Commissar-
I will check on the composition of the uniform and get back to you. I agree, I am not sure that the padded jacket would be the most comfortable thing during Russian summers (maybe a little more tolerable in the Baltic states). Then again and as you know, the Russian army didn't really care for the comfort of the troops.
"Yes, comrade, we have "winterwear, summerwear, and swimwear. Very nice."*
I've seen photos where they would wear the jacket only during the warmer season (if not issued the fully khaki uniform).
*Old 1980s commerical reference