I wore this jersey out for the first time this week. It was an early morning start in mid 30 temperatures. I wore I long sleeve merino base layer underneath. It was a little too chilly at first but soon warmed up once I got going and the sun kicked in. The wind stopper fabric in the front is great. I'll probably try to squeeze another layer underneath if if gets any colder. Be warned the fit is tight so order a size up if you like a little more room in your jerseys. Great quality product though. Craft make good stuff.