Excellent gloves for temps around 40 degrees. As others have mentioned the zipper will take some getting used to and the lack of touch screen compatibility is a bit disappointing but the comfort and performance make up for it in my opinion. I've become a big fan of Infinium fabric and Castelli gloves so buying these was an easy decision.
This is my second pair of Castelli cycling winter gloves and it quickly became my favorite go to. The zipper adds to functionality and enhances the fit. I love Castelli gear - very functional and stylish at the same time.
They do keep the hands warm and the zippers do help with adjustable venting when hands heat up. Zippers take time to get used to and can be a little frustrating. The biggest frustration is trying to use your device with these gloves on..... NOT happening. Have to take them off when having to use my devices. I've worn worse....I've worn better, but these fit my smaller hands the best and thats a big plus.