My fav helmet is the Lifedome. It has a really nice airflow system that can be turned on/off while riding for air cond. It also has vents by the ears (so you can hear) and covers the ears with plastic (no chinsy padding). It is not cheap (about 150) but you can get it at Alpine or Nortstar. I have not seen them in normal shops. I spent a long time looking for helmets and this is the one I liked best.