Under Armour Mens Storm Elements Insulated Breathable Golf Jacket from Golf Base. Looks like it has a small amount of insulation throughout and still thin enough to swing easily. I really do not like being cold. During the winter I usually end up with a polo shirt and then 2 long sleeves shirts of some type and quite often a sleeveless insulated vest over that. Hoping it will just be the Polo and a thin long sleeve under this jacket.