Chillout systems will be launching a refrigerant style cool suit system very soon. Rini Technologies is the only other company I'm aware of that has a refrigerant based cooling unit on the market, albeit at the cost of a 1.6L!
Not such an issue for the short SM races, but we've always struggled to maintain a Ice based cool suit system that can last the entire 2 hour stint for champcar. Its nice to see more products coming to market and lowering the price of entry.
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-Erik