Too cold is almost as bad as too hot, 200-270 is a must. Be careful not to tune FOR temps. If it's 50 degrees f out you may want something covering the head so it will warm up properly.
i axually used the ankle part of a sock acouple times to cover the fins if you notice it gets to hot just make it shorter so more fins are showing... that should work just watch your temp alot closer when you have it coverd...