They're way thicker than the type of linen Alessio used last year for his 100% linen pants. Those are definitely not winter weight. And I was actually hoping they would be a little thinner but I'm not gonna complain. I'd say they could be used year round except on the coldest of nights. Having the half-lining up top is nice. I haven't worn them much since they arrived as they are a bear to get on over my potato farmer calves but I'm hoping they stretch out a bit. Really nice, though. Edit. They seem a bit coated. Not sure with what but basically I think they will keep out the cold a bit better than the L0s.