Not on THE bike but ON me, on the bike.

I'm a fan of flannel, have read about MTB shirts made with polyester and spandex built in, turns out some are all poly. Most of them are very spendy so I was put off by that but many of them are very cool to be sure.

I finally stepped up when I found them at Eddie Bauer and go on sale all the time, often for 1/2 price, still a bit spendy and 100% poly.

These work fantastic for me, layered with merino and a cotton tshirt can be good well into the 40's, I was amazed how well they work and very easy to regulate by unbuttoning, rolling up the sleeves and managing the base layers, keeping hands warm, etc.

EB's are now comfort, stretchy and another level more comfortable with spandex added, LL Bean has wool blend versions and cotton one's as well, may be trying one of those out after Christmas.

Again, these work fantastic and are amazing, IMO.

Turns out they are on sale for 1/2 off right now.

https://www.eddiebauer.com/p/1292459...e%20Blue&size=

I now have a closet full of these and wear them all the time.