If you already own a T-Equalizer shirt, then you will be pleased to know that it is now available in a baseball cap. Powered by two included 2 CR2032 batteries, they are hidden away in the lining of the back of the head wear. In a one size fits all, a sensor allows adjustment for loud and soft environments. While we expect that the hat will be more popular with those who can actually see it, take comfort in the fact that for £12.95 (~$21.00) you were the one who was smart enough to purchase it first.