Cycling in the rain and what you wear underneath
Short answer: Rain gear keeps water out and sweat in. That is why the base layer matters as much as the jacket once a ride lasts more than twenty minutes.
The moisture comes from inside
Under a tight rain jacket you get wet from your own sweat, not just the rain outside. A layer that moves moisture away from the skin makes the ride bearable, even when the jacket keeps everything else out. Cotton does the opposite and turns cold the moment it gets damp. See bamboo undershirt for men.
Socks get wet regardless
Water runs down the leg and finds its way into the shoe, no matter how well the rain gear otherwise fits. A spare pair of socks at work is the most reliable solution, not a waterproof shoe cover. Change them right away so your feet are not cold for the rest of the day. See bamboo socks for men.
Change on arrival
Undershirt and socks carry the most moisture after a ride in the rain. Change both and let the rest of the clothing dry on a hanger instead of inside a closed bag. Five minutes of changing does more for the rest of the day than anything else you can do. See bamboo underwear for men.
Ventilation matters as much as waterproofing
A fully sealed jacket keeps rain out but also traps moisture inside. A jacket with ventilation at the back or under the arms lets moisture escape without letting rain in. That detail matters more than waterproofing alone on longer rides.
Avoid cotton entirely on the bike
Cotton absorbs moisture and holds onto it, which makes it cold and heavy on the bike. A synthetic or bamboo based layer moves moisture along instead of storing it. That difference is most obvious under rain gear, where air cannot circulate freely.
Pace changes how much you sweat
The faster you ride, the more sweat the body produces, even in cool rain. Slow down slightly on wet days so the base layer does not have to handle more moisture than needed. Staying dry is easier than drying off afterwards.
Pack a spare set, not just for the feet
If the ride takes longer than twenty minutes in the rain, it is not only socks that need changing. A spare undershirt in the bag means you are not sitting in something damp for the rest of the day at work.
Wash the rain gear often, not just the base layer
A jacket that loses its coating no longer keeps water out, and then the base layer gets wet no matter how good it is. Follow the maker's instructions for washing and re-treat it a few times a year.
Plan the route around the weather, not the other way around
If a more sheltered route exists, take it on wet days. Less direct exposure to rain and wind means less work for both the jacket and the base layer.
Frequently asked questions
What should you wear under rain gear?
A thin layer that moves moisture away from the skin. Cotton gets wet and cold under a tight jacket and should be avoided entirely.
How do I keep my feet dry on the bike?
That rarely works fully. Bring a spare pair of socks to the office instead of chasing an impossible solution.
Does it help to open the jacket slightly?
Yes, ventilation at the zip or under the arms reduces moisture more than any fabric can manage alone.
You can find the full range at Bamboo-Clothing.com.
