Last month I swore off synthetic jerseys for good and made the switch to merino wool. Now the act of swearing something off seems to imply that the line has been drawn in the sand, the switch has been made, and said behavior would end the very moment the swearing took place. The problem with this particular swearing off is that merino wool is kind of expensive.
It's taken me a month but I finally purchased a couple of wool jerseys and so far I am very happy. Both jerseys were purchased on eBay where I avoided the sometimes ridiculous cost of super fancy wool. The first is a short sleeved retro jersey by Sombrio which includes a shifty looking dirtbag with every purchase.
"Our fine clothing is made from the pubic hair of freaky man/sheep centaur things we find wandering around middle earth, I mean New Zealand"It's been too warm to really give them the proper going over. I did wear the long sleeve Icebreaker all last week where the temperature ranged form 45° to 70°. In the mornings I had to wear my vest to block the wind as that seems to be the only thing merino wool can't do. The wool regulates temperature extremely well. I was warm at 45° and warm, not roasting at 70°.
The 260 weight wool is not ideal at 70° but it's doable and I can't say that for a thicker synthetic. For additional versatility I got the short sleeved lighter weight Sombrio jersey. On warmer fall days I can wear it combined with my wool arm warmers if they're needed.
As a bike commuter this flexibility is priceless, (almost). This time of year I usually have to stuff my bag with additional jerseys and arm/knee warmers to combat the temperature fluctuation. With the wool at least I can leave the extra jersey and arm warmers at home.