Are they very warm or more fore the spring?

I think "Fall Line" refers more to the topography of a mountain than it does to the season, FYI

Hey Alec, I honestly don't know why they are called "Fall Line" as they are perfect all-weather, all-condition gloves. Prior to buying them, I assumed they'd only be good for the spring but they turned out to be my favorite gloves that I used for everything -- from winter camping in the backcountry to snowmobiling. I love to try new gear so I rarely replace jackets, gloves, etc. with the same product. Unfortunately, I lost one of my Hestra FL gloves this winter -- there was no question about replacing them; I had to get a new pair exactly like them. They may be a little too warm if the temps get above freezing but, otherwise; don't hesitate to buy these or, for that matter, any Hestra product. They are worth every dime! Hope my untimely answer helps.