DeFeet Un D Shurt Long Sleeve

I deliver papers every morning and have sworn by a certain type of insulated long sleeve undershirt for warmth during the winter. It can get cold riding around at 4 in the morning with the temperature at 25 F and colder with the windows rolled down. I purchased my first DeFeet long sleeve shirt for bike riding during the winter months 3 years ago and found out how warm it will keep you while bike riding. I started wearing it when I deliver papers and now I will not wear anything else. I don't have to use as many layers to keep warm when I wear the DeFeet as a base layer. It is thinner and easier to wear while working. No more cotton or polyester blend insulated undershirts for me.

I like this undergarment. Good fit, and it helps keep my core warm. I plan to purchase another.

This is the first layer for chilly riding days and I've found it to be comfortable and cool enough for wearing under a short-sleeve jersey on days of 60-70 degrees, and not uncomfortable even if it warms up beyond that.

Somewhat pricey - but excellent base layer for fall, winter, and spring. Its durable and ends up being well worth the price.