Atama summer weight: bought for about $80 at GroundandPound.com too. I have an A1 and it’s just 3 lbs.
I loved this gi during the summer; at a school without A/C it regularly reached 100-110 degrees inside, and even with industrial fans on, it was super hot. This is very comfortable in the hottest weather, but I suspect people who grip fight with really strong opponents would be unhappy.
It is made with the same sort of fabric a normal karate gi uses, maybe a bit thicker, but definitely not the thickness of a BJJ gi. However, the collar is just as thick and stiff. The pants fit fine; the drawstring is also self-fabric, but is narrower so it adjusts more easily. Unlike the other two, though, these pants feel better when tied at your actual waist instead of a little below it, because they have a longer rise.
Grade: A for the heat of summer; B- for the rest of the year.
Check our Georgette over at her awesome blog!