Sti Foam

Also, what are the levels of STI foam. In the description of a couple of pairs of shoes I want to buy, they say STI Foam level Foam level 2 1/STI. What is the best, the level 1 or level 2?

durable skate shoes are KSL DOS (my favorite), The Boss, Reynolds 2, No Skool, and eras AV. IST (Institute of Technology only) is a technology to protect feet. levels simply means where and how much foam is in level 2 inches is better, but G2 system is the best