In general I hate (dislike) answering questions about how warm or cold something is good for. Every one of us has different feelings when it comes to what is comfortable, and weather conditions can vary from hot/humid-hot/dry-cold/damp-cold-dry and these have a great effect on your comfort as well.
What I can say is that the Infinity wicks well, and is likely to be usable in moderately hot weather, but it is not mesh, and can't be expected to perform like a t-shirt either. :)
As for the Genius/Tempest, they are EXACTLY the same other than the gauntlet.