Nordic Wisdom(?) wrote:
Not sure I agree with all the Wool fans on here.
On a training run, sure, nice and cosy.
But for an elite Marathon race I think it retains too much water, adding a lot of unnecessary weight.
I think ideally all the clothes should be made of materials that retain as little water as possible. Something like polypropylen would be good.
I think a Brynje style fishnet long-sleeve (these are made with polypropylen) with a very light, form fitted windbreaker on top could be an optimal solution.
We use these fishnet base layers a lot here in the Nordic countries.
Because of all the holes, it retain very little water, and you also don't get that wet feeling on your skin, as the contact area is quite small. But it's plenty warm if add windproof layer on top.
I agree that wool is going to retain moisture more than another synthetic. But I’ve never had it be an issue on long runs in Oregon winters. The key is a light base layer. Most Smartwool is a 50/50 or 80/20 blend with a Nylon which eliminates the itchy factor and can make a material lighter. If it’s fitted to skin it won’t feel much heavier than any other synthetic once wet. I’d take that over a freezing synthetic option in wet and cold. Never seen the fishnet baselayer before. Interesting.