Me and my son currently wear Browning Hydrofleece and XPO for colder weather but am wanting something not quite as bullky since we bow hunt 80% of the time but do not want to loose the warmth either...I looked at the UA jackets last year for him but it's hard for me to believe it would be that warm as thin as it is...Looking for feedback to anyone that has it...not wanting to have to wear 5 layers of clothes to stay warm in really cold weather