These things are warm and keep the wind out well. The fit was great and the chamois is decent. Haven't had any issues riding in sub 40 degree weather. Only issue I have is that the crotch area could use some more insulating but wearing a base layer down there helps out a lot.
I'd heard a lot of good things about Sportful products and to say I was underwhelmed by these tights would be a huge understatement.
Lots of negatives about these. The thermal fabric on the back doesn't do nearly the good job Sportful claims it does and I found that at 43 degrees on a windy day, the back of my legs and especially my butt struggled to stay warm. The chamois pad is one step above garbage, it doesn't cushion your butt well and the perineum portion is awful - on a 35mi ride, I was numb and sore after and had to push through pain after mile 18. I've had $40 shorts with better chamois. Straps are a tad short me at 6'3" tall
While the Gore-tex Infinium is warm and almost fully windproof on the front, the sewn-through seams on the crotch front allow wind to pass through when gusts are above 20mph and/or if you're riding fast, so your dangly bits get chilly frequently. Overall fit is excellent and construction seems good. Easy to get on and off.
These would be decent tights with a better chamois and fully Infinium front and back, assuming they added an extra layer in the crotch area, or seam taped the sew-through seams. Even then these aren't a real cold temp tight, would max out in the mid 30's I expect. But as they stand, these tights are a major disappointment, particularly for the cost.