How to pick a winter jacket for city cycling
A city ride is short, slow and stop-start. That changes what a good winter jacket looks like. You need less warmth than you think, and much more wind and rain protection.
Start with wind, not warmth
On a bike you make your own wind, and moving air pulls heat off you far faster than still air of the same temperature. A thick jacket that lets wind through will still feel cold.
So look at the outer layer first. A tight weave, a taped front zip and a high collar do more for you than extra filling. Thin and windproof beats thick and open, almost every time.
A simple test in the shop: hold the fabric up and blow through it. If you feel your breath on the other side, the wind will get through too.
You will get warm, so plan for it
The first five minutes are cold. After that you are working, and a jacket that felt right at the door feels like too much. Most people buy one size too warm because they judge it standing still.
Pick a jacket you can open while riding. Underarm zips, a two-way front zip and a loose cuff all let heat out without stopping. If the jacket has none of these, your only option is to sweat.
Sweat is not only uncomfortable. Wet layers stop insulating, so you arrive warm and then get cold the moment you lock up. Dress for minute ten of the ride, not minute one.
A light shell over a thin wool layer handles more days than one heavy coat. A single jacket that does both is worth more than two that each do half.
The details that decide it
Fit comes next. On a bike you lean forward, so a jacket cut for standing rides up at the back and pulls at the shoulders. A longer tail and a little extra room across the back fix both.
Check the sleeves with your arms out in front of you, the way they sit on the bars. If the cuff slides back and shows your wrist, the sleeve is too short, whatever the label says.
Then the small things. Pockets you can reach with a bag strap across your chest. A hood that fits under or over a helmet, not somewhere in between. Something reflective on the parts that move, because moving light is what drivers notice.
None of this is expensive to get right. It is only easy to forget in a shop, where you are warm, standing up and not in the rain.